-
M. Tamura
Article type: Article
1993 Volume 44 Issue 1 Pages
1-2
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
-
TAKASHI SUGAWARA
Article type: Article
1993 Volume 44 Issue 1 Pages
3-10
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
Sexual polymorphism in Moehringia lateriflora was investigated in terms of the morphology and reproductive potential of flowers different in sex expression in natural populations. Throughout field survey, two different plants, hermaphrodite and female, were found in the three examined populations. Hermaphrodite flowers are protandrous, and have larger petals and longer filaments. Their anthers produce a large number of pollen grains, although their fertilities vary among and within the populations. Female flowers, on the other hand, have smaller petals, shorter filaments, and abortive anthers that completely lack pollen grains. Despite apparently disadvantageous floral attributes for attracting pollinators, the female flowers usually produce seeds equivalent to the hermaphrodite ones in natural populations. Moreover, stigmas of the female flowers mature earlier relative to flower opening than those of the hermaphrodite ones.
View full abstract
-
HIROSHI TAKAHASHI, YUKI KIRIYAMA, ASAKO UKAI, MINORU YAMADA
Article type: Article
1993 Volume 44 Issue 1 Pages
11-19
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
The pollination and reproductive biology was investigated in Hosta longissima, which occurs in open marshes, bogs and wet floors of closed forests. The flower of H. longissima is ephemeral and wilts in early afternoon of the anthesis day. It is homogamous and self-compatible, and the stigmata of most flowers are situated near the anthers. The flowers of the plants in closed forests secrete little or no nectar and appear to be mostly self-pollinated by small flies foraging for pollen. In open fields, on the other hand, the large bees of Bombus and Amegilla visit the nectar-rich flowers to forage for nectar and pollen, and small bees of Lasioglossum visit them to forage for pollen. These bees also apparently deposit much self-pollen onto the stigma in the same flower, while they appear to cross-pollinate in particular in somewhat herkogamous flowers. The bees may widely disperse the pollen. Investment to nectar may benefit both male and female functions in these apparently habitually selfing plants.
View full abstract
-
HIROYUKI AKIYAMA
Article type: Article
1993 Volume 44 Issue 1 Pages
21-26
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
A new species, Fissidens dalamair H.Akiyama, is described based on a specimen collected at the west foot of Gunung (=Mt.) Niut, West Kalimantan, Indonesia. It grows on boulders deeply submerged in flowing water. Fissidens dalamair has a rigid texture, long, slender stems, well developed rhizoids at the base of the stems, leaves inserted at an angle of 45 degrees to the stem, and multilayered margins throughout the leaf ; all these might be adaptive features for a submerged life style. The species is probably related to F. nobilis Griff., another rheophytic species widely distributed in Asia.
View full abstract
-
MICHIO TAMURA
Article type: Article
1993 Volume 44 Issue 1 Pages
27-28
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
A new species of Myosurus from South Africa is described. One species of Ranunculus from South America is transferred to Halerpestes and four species to Krapfia. A variety of Halerpestes is raised to species level.
View full abstract
-
HIROSHIGE KOYAMA
Article type: Article
1993 Volume 44 Issue 1 Pages
29-34
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
Vernonia sect. Decaneurum in Thailand is taxonomically examined. Four species of woody climbers and 2 species of shrubby herbs are recognized in the section. They are Vernonia andersonii, V. eberhardtii, V. garretiana, V. scandens, V. divergens and V. saligna.
View full abstract
-
AKIKO SOEJIMA
Article type: Article
1993 Volume 44 Issue 1 Pages
35-51
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
The Aster leiophyllus complex is taxonomically complicated and includes many related taxa representing polyploid series. It has been reported that two taxa of this group are distributed in Kyushu. However, there are many herbarium specimens collected in Kyushu which cannot be identified to either of them. In this study, morphological variations were examined in relation to ploidy level, and taxonomic consideration was given. As a result, three species and one variety are recognized in Kyushu : A.leiophyllus var. leiophyllus (2x, 6x), A. semiamplexicaulis (2x), A.leiophyllus var. intermedius (4x) var. nov. and A. satsumensis (2x) sp. nov. The distribution range of diploid A. leiophyllus var. leiophyllus is limited to a small area of Fukuoka, Nagasaki and Miyazaki, while the hexaploids occur widely in and around volcanic regions such as Mts. Aso-Kujiu, Unzen and Kirishima. A. leiopyllus var. intermedius is distributed in the north-eastern part, A. semiamplexicaulis in Oita and the northern part of Miyazaki, and A. satsumensis mostly in the southern part of Kyushu.
View full abstract
-
KAZUO OGINUMA, ATSUSHI KATO, HIROSHI TOBE, S.G. MATHENGE, F.D. JUMA
Article type: Article
1993 Volume 44 Issue 1 Pages
53-58
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
somatic chromosome number and morphology of six woody plant species, native and introduced in Kenya, are investigated using meristematic cells of young leaves. Chromosome number reported is 2n=28 in Schinus molle (Anacardiaceae), 2n=30 in Euphorbia cotinifolia (Euphorbiaceae), 2n=26 in Ficus natalensis (Moraceae), 2n=44 in Syzygium jambos (Myrtaceae), 2n=22 in Aulacocalyx laxiflora (Rubiaceae), and 2n=14 in Gnidia oppositifolia (Thymelaeaceae).
View full abstract
-
CHISAKO YOSHIDA, HIDEKI TAKASU
Article type: Article
1993 Volume 44 Issue 1 Pages
59-66
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
The leaf life-span was studied for twenty-one species of ferns in the Kii Peninsula, southern Japan. Each leaf was marked and monitored during the period from early emergence to the final stage of decaying. Field investigations were carried out at monthly intervals from April, 1989,to December, 1992. Generally, the fern leaves were not defoliated and the degree of decaying was shown by the green area present (percentage to the total laminal area). There were two types of decaying in evergreen species -sudden and gradual decaying. In both types, the decaying of old leaves was accelerated just in the period of emergence of new leaves. Leaf life-spans of most summer green species were about 200 days. Of the ferns examined, Asplenium wrightii had the longest (1117 days) mean leaf life-span.
View full abstract
-
MASAMICHI TAKAHASHI
Article type: Article
1993 Volume 44 Issue 1 Pages
67-73
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
Previous studies on exine development of pollen are reviewed, with special attention being paid to homologies in exine stratification. The primexine scheme is criticized and a new model of exine pattern determination involving invagination of the plasma membrane is proposed. Supratectal elements are formed during the free microspore stage ; the supratectal elements should be regarded as different from the tectum, the pattern of which is formed during the tetrad stage. Other exine development patterns are also shown ; omniaperturate pollen and columellaless exine are also discussed in this review.
View full abstract
-
T. NAKAMURA, Y. KADONO
Article type: Article
1993 Volume 44 Issue 1 Pages
75-76
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
-
T. NAKAMURA
Article type: Article
1993 Volume 44 Issue 1 Pages
77-
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
-
T. KOBAYASHI
Article type: Article
1993 Volume 44 Issue 1 Pages
78-80
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
-
G. MURATA
Article type: Article
1993 Volume 44 Issue 1 Pages
80-
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
-
M. YAMANAKA
Article type: Article
1993 Volume 44 Issue 1 Pages
81-
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
-
M. MUKAI, H. TAKASU
Article type: Article
1993 Volume 44 Issue 1 Pages
82-85
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1993 Volume 44 Issue 1 Pages
85-
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1993 Volume 44 Issue 1 Pages
86-
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1993 Volume 44 Issue 1 Pages
86-87
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1993 Volume 44 Issue 1 Pages
87-
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1993 Volume 44 Issue 1 Pages
90-92
Published: August 30, 1993
Released on J-STAGE: September 25, 2017
JOURNAL
FREE ACCESS