Calymperes cucullatum P.-J. Lin, Acta Phytotax. Sin. 17(1): 96. 1979. Type. China: Hainan, P. C. Chen et al. 745a (holotype PE; isotype IBSC); P. C. Chen et al. 766b, 775 (paratypes IBSC).

Plants small, compact, yellowish to blackish green, in low dense turfs and cushions. Stems short, forked; rhizoids brown. Leaves dimorphic, often secund, not much contorted when dry, erect-spreading when wet, vegetative leaves oblong-lanceolate, gemmiferous leaves narrowed distally to often more or less spatulate tips, leaves mostly broadest at shoulders, to 4 mm long, axillary hairs inconspicuous; cells of upper laminae obscure, isodiametric, bluntly or sharply unipapillose abaxially, mammillose-papillose adaxially; margins slightly thickened distally or unistratose, entire except serrate at shoulders; teniolae usually distinct, sometimes indistinct or even lacking in some leaves, most prominent at shoulders; cancellinae characteristically broad distally, often appearing truncate. Gemmae common, blackish, in hairbrush-like tufts on adaxial surface of costa tip, often in a distinct, expanded, saucer-shaped gemma receptacle. Sporophytes not seen.

Type. Rauwack, Gaudichaud s.n. (holotype G; isotypes BM, FH, L, NY).

Chinese specimens examined: HAINAN: Chang-jiang Co., P.-J. Lin et al. 3051 (IBSC, IFP, LAF); Ling-shui Co., P.-J. Lin et al. 2593 (IBSC, LAF, PE); Bau-long Forestry Station, P.-J. Lin et al. 311a (IBSC, LAF, SYS). YUNNAN: Xi-shuan-ban-na, Redfearn et al. 33829 (IBSC, LAF, MO).

Habitat: infrequent on tree trunks and bases in forests at moderate elevations, 550–720 m; Distribution: from Sri Lanka and the Andamans eastward through Malaysia, Australia, and Oceania.

This species is easy to recognize. The hairbrush-like tufts of dark gemmae adaxial on the leaf tips (often in distinctive gemma receptacles) are diagnostic. Also the broad, truncate cancellinae and short, broad vegetative leaves with the teniolae distinct at the leaf shoulders help in identification. Calymperes graeffeanum is similar in many respects, including bearing gemmae ventrally on leaf tips (often in a distinct gemma receptacle) but lacks teniolae. Calymperes tenerum is also similar in some respects but it too lacks teniolae and bears its gemmae all around on the tip of the excurrent costa. The name C. palisotii subsp. moluccense (Schwaegr.) Menzel is sometimes used for this taxon.

Illustrations: Reese & P.-J. Lin 1991 (figs. 44–52).