Radulaceae is a family occurring in all continents but Antarctica, with its only genus Radula Dumort., containing more than 200 species. A peculiar new species was found in the Mananara North Biosphere reserve and National Park in the northeast of the island of Madagascar. The new species, although I have found exclusively on living leaves, does not show the morphologic characters of the artificial section Radula sect. Epiphyllae Castle ex Grolle (tiny plants, stem with single, unpigmented cortical layer and thin walled medullary cells and production of abundant sporophytes or gemmae). It is a robust, sterile plant with much thicker stem, 12–15 cells wide, consisting of somewhat thickened, slightly pigmented cortical and medullary cells. The most characteristic feature is the very regularly densely pinnate (to bipinnate) branching system with closely imbricate leaves. The leaves are not caducous, and the leaf cells bear a smooth cuticle. The lobule is quadrangular with an obtuse or apiculate apex, about half the length of the lobe. The new species bears a superficial resemblance to R. appressa Mitt., a widespread African species and to an unclarified taxon: R. silvestris Gottsche, described from Madagascar. From these the new species is distinguished by the above-mentioned characteristics.
Seven species of the genus Bryum Hedw. are transferred to other genera for upcoming treatments of the Bryaceae for the Aleutian Islands and Hawaiian Islands. These are Gemmabryum flavituber (R.Wilczek & Demaret) J.R.Spence, G. mauiense (Broth.) J.R.Spence, Imbribryum baldwinii (Broth.) J.R.Spence, I. megalostegium (Sull.) J.R.Spence, Ptychostomum hawaiicum (Hoe) J.R.Spence, P. sibiricum (Lindb. & Arnell) J.R.Spence, and P. vermigerum (Arnell & C.E.O.Jensen) J.R.Spence.
An extinct liverwort species Metzgeriites kujiensis T.Katag., sp. nov. is described from the Late Cretaceous (Santonian, ca. 85 Ma) amber from the Kuji district, northern Honshu, Japan. It is characterized by thalloid plants with a distinct midrib and lamina, narrow thalli of 0.6–0.8 mm wide, regularly 1-pinnate ramification pattern, and presence of discoid branches. The new species represents the first record of the liverwort family Metzgeriaceae (Metzgeriales, Marchantiophyta) from the Late Cretaceous from East Asia.
Detailed morphological descriptions of a little-known Japanese species, Riccia wichurae Steph. are given based on the type specimen. SEM images of the spores are also provided for the first time. The species is mainly characterized by 0.6–1.0 mm wide thalli with deep median grooves, lacking air chambers, purple or hyaline ventral scales, and large spore size (75–)80–90(–100) μm with irregular thickened wing margins. The author proposes that the species should be treated as a synonym of R. beyrichiana Hampe ex Lehm. which is widely distributed in Japan.
Plagiochila alaskana A.Evans has been considered as an extreme form of P. semidecurrens (Lehm. & Lindenb.) Lindenb. and also recognized as a variety: P. semidecurrens var. alaskana (A.Evans) Inoue. After studying the holotype of P. alaskana the authors are of the opinion that P. alaskana should be considered as an independent species and not as a variety under P. semidecurrens. Study of the holotype specimen of a further taxon in this group, Plagiochila semidecurrens var. longifolia Inoue reveals leaf length : width ratios ranging from 1.5–2.5 : 1.0 which in turn supports the view of it being a habitat modification of P. semidecurrens. Therefore, we are of the opinion that var. longifolia should be treated as a synonym under P. semidecurrens as proposed by Inoue.
Three species of Fissidens, viz. F. gracilifolius Brugg.-Nann. & Nyholm, F. laxitextus Broth. ex Gangulee and F. pseudoclosteri Z.Iwats. & S.S.Kumar are newly reported for China. In addition, seven species, viz. F. beckettii Mitt., F. flabellulus Thwaites & Mitt., F. jungermannioides Griff., F. kinabaluensis Z.Iwats., F. serratus Müll.Hal., F. subangustus M.Fleisch., and F. wichurae Broth. & M.Fleisch. are new provincial records for Guangxi. Photographs and diagnostic characters to help distinguishing the new records are provided.
Based on morphological investigation and molecular phylogenetic analysis, we find that the previous concept of Didymodon nigrescens (Mitt.) K.Saito sensu Saito in Japan includes D. nigrescens and D. subandreaeoides (Kindb.) R.H.Zander, the latter newly reported from Japan. Morphological and phylogenetic data from Japanese material clearly segregate these species from each other. In addition, Japanese D. nigrescens shows two groups, with morphological traits supporting the phylogeny, requiring further morpho-molecular evaluation based on broad sampling. Descriptions with analytical illustrations are provided based on Japanese material. Andreaea takakii Sakurai is proposed as a synonym of D. subandreaeoides.