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HELEN P. RAMSAY, G. A. M. SCOTT, PATRICIA M. SELKIRK
1982 Volume 52 Pages
1
Published: June 29, 1982
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R. M. SCHUSTER
1982 Volume 52 Pages
3-35
Published: June 29, 1982
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ELLA O. CAMPBELL
1982 Volume 52 Pages
37-44
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HIROSHI INOUE
1982 Volume 52 Pages
45-56
Published: June 29, 1982
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D. G. CATCHESIDE
1982 Volume 52 Pages
57-64
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H. OCHI
1982 Volume 52 Pages
65-73
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TIMO KOPONEN
1982 Volume 52 Pages
75-86
Published: June 29, 1982
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The moss family Mniaceae consists of 9 genera and 72 species. Most of the genera are circumpolar arctic to temperate in distribution. Only 5 species occur in Australasia, and 2 more species are present on Hawaii. The genus Orthomnion Wils. and Plagiomnium sect. Rostrata (Kindb.) T. Kop. have gone through a convergent evolution in Asia - Australasia. The characters which have evolved include the change of the sexual system, deterioration of the leaf border and the loss of the decurrent leaf base. Continental drift and subsequent evolution, convergent toward the northern hemisphere P. rostratum (Schrad.) T. Kop. are proposed to be the best explanation for the presence of synoecious P. novae-zealandiae (Col.) T. Kop. in Australia and New Zealand. This hypothesis is based on the Gondwanalandic origin of Plagiomnium sect. Rostrata.
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AUNE KOPONEN
1982 Volume 52 Pages
87-91
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HISATSUGU ANDO
1982 Volume 52 Pages
93-106
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R. D. SEPPELT
1982 Volume 52 Pages
107-112
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ZENNOSKE IWATSUKI
1982 Volume 52 Pages
113-126
Published: June 29, 1982
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S. R. GRADSTEIN, WILLIAM A. WEBER
1982 Volume 52 Pages
127-152
Published: June 29, 1982
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De las Islas Galápagos se conoce más de 200 especies de briófitas (el número total de los musgos y de las hepáticas es de mas o menos igual). Más que 2/3 partes de las especies occurren en la selva y matorrales perennifolias y húmedas limitadas a las zonas altas de algunas islas.
Una proporción elevada (65-70%) de la brioflora trata de especies de una distribución amplia y neotropical o ampliamente tropical, que probablemente han llegado cón los vientos predominantes orientales del continente sudamericano. Generalmente las briófitas de las Islas Galápagos tienen una dispersión excelente, al contrario de otros grupos de organismos.
Mas o menos 85% de las hepáticas produce espores y/o gemmae y aproximadamente 40% de las especies son bisexuales. Además es interesante anotar que taxa sin diásporas están limitados hacia una sola isla, y que taxa con formación de diásporas tienen una distribución más ámplia según las condiciones ecológicas favorables. Una proporción bastante elevada (20%) de los musgos pertenece al elemento “oceánico-Caribe” probablemente llegado con los vientos alisios desde las costas de Centro-América o directamente de las Antillas via el Istmo de Panamá
Este grupo de especies se encuentra en las Islas Galápagos en alturas más bajas, con preferencia cerca de la costa. Unas pocas especies templadas y disyuntas están presentes en las pampas frias y secas de Isabela arriba de 1200 m. Además taxa cosmopolitos y ciertos taxa endémicos son común en las pampas.
La proporción de los taxa endémicos es más elevada entre las hepáticas (16%) que entre los musgos (6%). Taxa endémicos occurren con preferencia en las regiones abiertas y secas en las Islas Galápagos, probablemente debido a que este medio ambiente para selección natural y evolución existía ya hace más tiempo, como es corroborado por evidencia palaeobotánica.
Se trata de caracterizar y comparar la brioflora de Galápagos, aunque las listas de recopilación para briofloras regionales del trópico hacen falta en una forma tremenda. En comparación con la brioflora del continente sudaméricano la de las Islas Galápagos es un poco pobre en especies; faltan marcadamente taxa de la selva húmeda tropical y de selva nublada.
La proporción bastante elevada de hepáticas talosas del orden Marchantiales caracteriza la brioflora de las Islas Galápagos como mas o menos mesofítica y subtropical, a pesar de la presencia elevada de Lejeuneaceae.
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D. H. VITT
1982 Volume 52 Pages
153-159
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W. SCHULTZE-MOTEL
1982 Volume 52 Pages
161-162
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HELEN J. HEWSON
1982 Volume 52 Pages
163-165
Published: June 29, 1982
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P. M. SELKIRK, D. R. SELKIRK
1982 Volume 52 Pages
167-169
Published: June 29, 1982
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GEORGE A. M. SCOTT
1982 Volume 52 Pages
171-177
Published: June 29, 1982
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ROBERT WYATT
1982 Volume 52 Pages
179-198
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NANCY G. SLACK
1982 Volume 52 Pages
199-217
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R. E. LONGTON, C. J. MILES
1982 Volume 52 Pages
219-240
Published: June 29, 1982
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LEWIS E. ANDERSON, JERRY A. SNIDER
1982 Volume 52 Pages
241-254
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HELEN P. RAMSAY, G. K. BERRIE
1982 Volume 52 Pages
255-274
Published: June 29, 1982
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A. J. E. SMITH, HELEN P. RAMSAY
1982 Volume 52 Pages
275-281
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E. A ODU
1982 Volume 52 Pages
283-285
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CHIEN GAO
1982 Volume 52 Pages
287-293
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JOHN PICKARD
1982 Volume 52 Pages
295-297
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SHAUN RUSSELL
1982 Volume 52 Pages
299-302
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HILDUR KROG
1982 Volume 52 Pages
303-311
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H. MAYRHOFER
1982 Volume 52 Pages
313-321
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D. L. HAWKSWORTH
1982 Volume 52 Pages
323-329
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TEUVO AHTI
1982 Volume 52 Pages
331-341
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MARTYN J. DIBBEN
1982 Volume 52 Pages
343-355
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D. L. HAWKSWORTH
1982 Volume 52 Pages
357-366
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B. RENNER
1982 Volume 52 Pages
367-377
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R. HONEGGER
1982 Volume 52 Pages
379-391
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VERNON AHMADJIAN, JEROME B. JACOBS
1982 Volume 52 Pages
393-399
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M. R. D. SEAWARD
1982 Volume 52 Pages
401-406
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JOHN A. ELIX
1982 Volume 52 Pages
407-415
Published: June 29, 1982
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The taxonomic status of a variety of chemically characterised lichen populations is considered. In Parmelia subg. Xanthoparmelia where chemistry is a very significant character in the delimitation of species, the recognition of taxonomically insignificant accessory metabolites is of considerable importance. A group of aliphatic acids and amino-acid derivatives are demonstrated to fall into this category. On the other hand taxa containing different phenolic metabolites, even when these may be biosequential in nature, can usually be distinguished morphologically.
The New Zealand endemic, Parmelia testacea, has been shown to occur in four chemical races. Individuals comprising all the possible combinations of these races have been detected attesting to the interchange or combination of genetic material between them. Chemical combinations have also been detected in the Australian (Queensland) species Ramalina leoidea while Hypogymnia lugubris occasionally produces the depside olivetoric acid in place of (or together with) the isostructural depsidone, physodic acid.
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ROSMARIE HONEGGER
1982 Volume 52 Pages
417-429
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WILLIAM E. WINNER, GEORGE W. KOCH
1982 Volume 52 Pages
431-440
Published: June 29, 1982
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The analysis of bryophyte air pollution resistance requires study of both their air pollution uptake capacities and their ability to resist biochemical damage from absorbed pollutants. Both the uptake rates and the effects of air pollutants on the metabolism of mosses are related to the gametophyte hydration state. As bryophytes desiccate, their capacity to absorb pollutants decreases as does their initial photosynthetic sensitivity to pollution. Finally, in the air dried state, the air pollution resistance of mosses is highest because their absorption capacity is lowest and they are metabolically inert. SO2 reduces photosynthesis during desiccation and this effect is conserved when plants are rehydrated. The responses of mosses to air pollutants are compared to responses of vascular plants and lichens.
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SINSKE HATTORI, MASAMI MIZUTANI
1982 Volume 52 Pages
441-448
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KOHSAKU YAMADA
1982 Volume 52 Pages
449-463
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ROBERTO LIGRONE, RAFFAELE GAMBARDELLA, ROSA CASTALDO, SIMONETTA GIORDA ...
1982 Volume 52 Pages
465-499
Published: June 29, 1982
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The results of an ultrastructural study on the female gametophyte stem and sporophyte of Buxbaumia piperi Best are reported and discussed. The gametophyte stem consists of large and highly vacuolated parenchymatous cells rich in lipid reservoirs. The gametophyte plastids are very small, lack starch, and have a rudimentary lamellar apparatus. There are several layers of transfer cells on the gametophytic side of the placenta, but only one on the sporophytic side. Both the sporophyte foot and the seta are composed of an outer and an inner parenchymatous cortex, and of a small central strand of only hydroids. Because of the presence of an extensive lacunar system in the inner cortex, the seta structural pattern appears to be fundamentally like that of the polytrichaceous mosses, although leptoids are lacking in Buxbaumia. In spite of the great reduction of the conducting tissues, the sporophyte of Buxbaumia is complex in structure at both the histological and ultrastructural level. In particular an unusual plastid diversification has been observed in the various tissues. It is proposed that this may be related to the presumed antiquity of the taxon.
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J. TAYLOR, L. W. MERICLE, C. MACKINNON
1982 Volume 52 Pages
501-505
Published: June 29, 1982
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