Phiangphak Sukkharak

World checklist of hornworts and liverworts

Abstract A working checklist of accepted taxa worldwide is vital in achieving the goal of developing an online flora of all known plants by 2020 as part of the Global Strategy for Plant Conservation. We here present the first-ever worldwide checklist for liverworts (Marchantiophyta) and hornworts (Anthocerotophyta) that includes 7486 species in 398 genera representing 92 families from the two phyla. The checklist has far reaching implications and applications, including providing a valuable tool for taxonomists and systematists, analyzing phytogeographic and diversity patterns, aiding in the assessment of floristic and taxonomic knowledge, and identifying geographical gaps in our understanding of the global liverwort and hornwort flora. The checklist is derived from a working data set centralizing nomenclature, taxonomy and geography on a global scale. Prior to this effort a lack of centralization has been a major impediment for the study and analysis of species richness, conservation and systematic research at both regional and global scales. The success of this checklist, initiated in 2008, has been underpinned by its community approach involving taxonomic specialists working towards a consensus on taxonomy, nomenclature and distribution.

Bryophyte Studies in Thailand: Past, Present, and Future

Abstract The historical development of bryophyte studies in Thailand is reviewed. Two historical periods are distinguished: the first period, 1899–1977, during which collections were made and studies were carried out by foreign botanists/bryologists in the framework of expeditions and the Flora of Thailand project; and the second one, 1977 to the present day, in which bryophyte work has been done mainly by Thai bryologists. In total, two species of hornworts, 20 of liverworts, and 63 of mosses have been described as new to science based on collections from Thailand. Of these, 48 are hitherto only known from Thailand and may be considered endemic to the country. Future work should focus more on taxonomic treatments of individual genera although further area-based research is also necessary.

On the occurrence of adnate underleaves and appendages in Thysananthus (Lejeuneaceae). Studies on the genus Thysananthus, 2

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Studies on the genus Mastigolejeunea (Marchantiophyta: Lejeuneaceae): Mastigolejeunea gradsteinii Sukkharak sp. nov.

Abstract The liverwort Mastigolejeunea gradsteinii Sukkharak sp. nov. (Lejeuneaceae) is described from Malaysia. The new species is characterised by (1) rigid stem with epidermal cells as large as medullary cells, (2) apiculate leaf apex, (3) curved lobules without teeth, and (4) perianths with 7–8 keels.

On the occurrence of asymmetrical underleaves associated with left-right symmetry in Mastigolejeunea, and the status of Mastigolejeunea undulata Gradst. & Grolle (Lejeuneaceae)

Underleaves of leafy liverworts may be bilaterally symmetrical or asymmetrical and are usually free from the leaves; occasionally they are adnate to the leaves on one or both sides. Adnate underleaves have been observed in the Lepodoziaceae genus Bazzania, in members of Lophocoleaceae (Chiloscyphus, Clasmatocolea, Heteroscyphus, Leptoscyphus, Lophocolea, etc.) and in the Lejeuneaceae genus Thysananthus (e.g., Fulford, 1963, 1976; Engel, 1980; Piippo, 1985; Srivastava & Srivastava, 2002; Sukkharak & Gradstein, 2010a; Sukkharak, 2014). Interestingly, adnation of underleaves in Thysananthus occurs in a left-right symmetrical pattern: on right-hand branches underleaves are connected to leaves on the left-hand side whereas on left-hand branches on the right-hand side (Sukkharak & Gradstein, 2010a). Left-right symmetry has to our knowledge not been observed in other genera with adnate underleaves and seems to support the distant relationship of Jungermanniales and Porellales (e.g., Frey & Stech, 2005; Heinrichs et al., 2005; He-Nygrén et al., 2006; Crandall-Stotler et al., 2009). Asymmetry of underleaves is commonly seen in the degree of dentation or lobing of underleaf margins, which may be more pronounced on one side than on the other. In addition, length of underleaf segments may vary in an asymmetric fashion with one or two segments being shorter, for example in species of Colura (C. usambarica E.W.Jones, C. saroltae Pócs), Kurzia, and Telaranea (e.g., Jones & Pócs, 1987; Grolle & Zhu, 2002; Schuster, 2002; Engel & SmithMerrill, 2004). An unusual type of underleaf asymmetry has been observed in Macrocolura sagittistipula (Spruce) R.M.Schust. (Grolle & Zhu, 2002). In this Correspondence to: Phiangphak Sukkharak, Department of Biology, Faculty of Science, Burapha University, 169 Long-Hard Bangsaen Road, Saen Sook Sub-district, Mueang District 20131, Chonburi, Thailand; email: phiangphak @buu.ac.th

Pseudoparaphysanthus linisii (Neckeraceae), a new combination and a new record for mainland South-east Asia

Stereophyllum linisii Enroth & B.C.Tan (Stereophyllaceae), a rheophytic species, is transferred as Pseudoparaphysanthus linisii (Enroth & B.C.Tan) S.He, Sukkharak & Chantanaorr. (Neckeraceae). The new combination belongs to the recently segregated genus that was established among Neckeropsis sect. Pseudoparaphysanthus. The species has recently been discovered in Thailand and thus new to mainland South-east Asia, representing the first record outside the type locality in the Philippines. Along with the description based on the Thai collection, light microscope photographs of the features of morphological importance and line drawings of the phyllotaxy of this species as well as a key to the genus Pseudoparaphysanthus are provided.

An additional variant of Jubula hutchinsiae subsp. javanica (Marchantiophyta: Jubulaceae) in Thailand

An additional variant of Jubula hutchinsiae (Hook.) Dumort. subsp. javanica (Steph.) Verd. is reported for Thailand based on a 2009 collection from the Nakhon Sri Thammarat province. A detailed description and illustrations are here provided.