Seven species, including two new species, of the genus Trichocolea Dumort.: T. iriomotensis T.Katag., T. japonica T.Katag., T. magna T.Katag., T. mollissima (Hook.f. & Taylor) Gottsche, T. pluma (Reinw., Blume & Nees) Mont., T. rudimentaris Steph., and T. tomentella (Ehrh.) Dumort., are recognized for Southeast Asia, including the New Guinea Islands. Distribution data, habitat, taxonomic notes, distinguishing characters of the species, and a key to the species of the genus Trichocolea are provided. Three new synonyms of Trichocolea pluma: Jungermannia tomentella var. javanica Reinw., Blume & Nees, T. samoana Steph., T. tonkinensis Steph., one new synonym of Trichocolea tomentella: T. tomentella f. nodulosa Nees, and one new synonym of Trichocolea rudimentaris: T. fragillima Herzog are proposed. Lectotypes are selected for T. australis Steph. (= T. mollissima), T. striolata Steph. (= T. pluma), T. levifolia Steph. (= T. pluma), and T. rudimentaris Steph. Phylogenetic analyses based on rbcL gene sequences revealed monophyly of Trichocoleaceae in which two clades Eotrichocolea–Leimotra clade and Trichocolea clade were resolved. It is suggested that epicoelocaules, as observed in Trichcocolea and Eotrichocolea, are independently derived from perianth-bearing shoots.
A new species, Fissidens touwii Tad. Suzuki & Z. Iwats. from Thailand is described. The species belongs to subgen. Sarawakia. Fissidens touwii is easily distinguished from other Fissidens species in the region by the following characteristics: regularly bistratose to pluristratose laminal cells, limbate only on vaginant laminae of all leaves, estomatose capsules, and Sarawakia-type peristome teeth.
Collections of Fissidens made by Messrs. T. Kamiyama and K. Shiina in Laos were found to include 30 species and 1 variety. Two of these species―F. kamiyamae and F. shiinae, ―new to science, are described and illustrated, as are F. albo-limbatus, F. axilliflorus, F. dentate-limbatus, F. firmus, F. semperfalcatus, F. thwaitesii, and F. zwickeyi. New additions to the Fissidens flora of Laos number 24 species and 1 variety. Keys to the subgenera, sections and species are provided.
The genus Pterogoniadelphus (= Felipponea) is taxonomically revised. Three species, Leucodon brachypus Brid., L. julaceus Hedw. and L. pendulus Lindb. are transferred to Pterogoniadelphus. Five species of Pterogoniadelphus are recognized conclusively, namely, P. assimilis (Müll. Hal.) Ochyra & Zijlstra, P. brachypus (Brid.) Tad. Suzuki & Z. Iwats., P. esquirolii (Thér.) Ochyra & Zijlstra, P. julaceus (Hedw.) Tad. Suzuki & Z. Iwats., and P. pendulus (Lindb.) Tad. Suzuki & Z. Iwats. Descriptions, specimens examined, distribution, notes, key to the species, and illustrations of five species are included.
Three species of Ulota, U. curvifolia (Wahlenb.) Lilj., U. megalospora Venturi, and U. morissonensis Horik. & Nog. are additions to the moss flora of Japan. Ulota longifolia Dixon & Sakurai, previously considered a synonym of U. crispa (Hedw.) Brid., is recognized as a good species.
Yakushimabryum longissimum H.Akiyama, Y.Chang, T.Yamag. & B.C.Tan is proposed as a new synonym of Aptychella tonkinensis (Broth. & Paris) Broth. Morphological comparisons and phylogenetic analysis based on chloroplast rbcL gene sequences supported our taxonomic treatment.