Plants small. Leafy stems unbranched, 4.3–8.2 mm long, 1.8–2.2 mm wide; axillary hyaline nodules lacking; central strand indistinct. Leaves in 6–13 pairs, usually densely and evenly arranged; lowest leaves small, middle and upper leaves lanceolate, 1.4–1.6 mm long, 0.3–0.5 mm wide, acute at apex; base of dorsal laminae wedge-shaped, slightly decurrent; costa stout, yellowish brown, ending below leaf apex or percurrent; margins entire except finely serrulate at apex; vaginant laminae ca. 2/3 the leaf length, more or less equal; limbidia prominent, yellowish on older leaves, nearly reaching leaf apex, 2–3 rows on apical laminae, 1–3 rows on dorsal laminae, 4–5 rows on vaginant laminae, usually 2–3, rarely 4–5, cells thick in cross section; cells of apical and dorsal laminae quadrate to irregularly hexagonal, 7–14 µm long, more or less thick-walled, smooth; cells of vaginant laminae similar to those of apical and dorsal laminae, but longer, with thicker walls toward the base near costa. Synoicous. Perichaetial leaves ca. 2.5 mm long, 0.5 mm wide. Archegonia terminal on stems, 284–312 µm long. Antheridia (190–)210–340 µm long, mixed with archegonia, but fewer in number. Setae 3.5–4.0 mm long, smooth; capsules erect, symmetrical; urns 0.5–0.6 mm long; exothecial cells rounded quadrate to rounded rectangular, with more or less thickened corners; opercula rostrate, ca. 0.4 mm long; peristome teeth ca. 0.2 mm long, 42 µm wide at base. Spores 10.5–21.0 µm in diameter.

Type. Indonesia: Java, Kandang-Badak, 2400 m, M. Fleischer s.n.

Chinese specimens examined: GUANGXI: Gui-lin City, T. Cao 21943 (IFSBH, SYS). TAIWAN: Da-xue Shan (Mt.), Iwatsuki & Sharp 2789 (NICH). YUNNAN: Geng-ma Co., Z.-Y. Zheng 1049 (HKAS, NICH); Jing-dong Co., J.-K. Zhang 1492 (YUKU, SYS); Kun-ming City, D.-K. Li 3003 (SHM, SYS); Qiu-bei Co., D.-K. Li 13c (HKAS, NICH).

Habitat: on wet rocks; Distribution: China, Korea, Japan, India, and Indonesia.

Fissidens geppii is characterized by 1) the synoicous and terminal inflorescence, usually without lateral male buds; 2) the strong limbidia, usually 2–3 (rarely 4–5) cells thick; and 3) being restricted to wet habitats.

Illustrations: Pl. 80, figs. 1–11.