31. Fissidens linearis Brid. var. obscurirete (Broth. & Par.) Stone 暗色凤尾藓 an-se feng-wei xian
J. Bryol. 16: 404. 1991. Fissidens obscurirete Broth. & Par. in Broth., Öfvers. Förh. Finska Vetensk. Soc. 51A(17): 7. 1909. Type. New Caledonia: A. Le Rat 948 (lectotype H-BR).
Fissidens microserratus Sak., Bot. Mag. (Tokyo) 47: 738. 1933.
small, green to dark green. Leafy stems
usually simple, rarely branched, 1.3–4.8 mm long, 0.8–1.6 mm wide; axillary hyaline nodules indistinctly differentiated; central strand not differentiated. Leaves
in 4–11 pairs, densely arranged; the lowest leaves much smaller; middle to upper leaves larger, narrowly lanceolate, 0.9–1.5 mm × 0.2–0.3 mm, narrowly acute; base of dorsal laminae wedge-shaped; vaginal laminae 1/2 the leaf length; costa yellowish, pellucid, percurrent to shortly excurrent; margins finely crenulate to serrulate; limbidia present only on lower one-half of the vaginant laminae of upper and perichaetial leaves; limbidia composed of 2–3 rows of cells, one cell thick; cells of apical and dorsal laminae quadrate to hexagonal, 5–9 µm wide, dark, obscure, pluripapillose, thin-walled; cells of vaginant laminae similar to those apical and dorsal laminae, but longer, thick-walled and with fewer papillae to smooth. Autoicous
to rhizautoicous. Archegonia
175–192 µm long. Setae
1.8–3.5 mm long, smooth, geniculate at base; capsules cylindrical, somewhat asymmetrical; urns 0.4–0.5 mm long; exothecial cells quadrate, thin-walled, with thickened corners; opercula long rostrate, ca. 0.4 mm long; peristome teeth 0.24–0.28 mm long, 30–33 µm wide at base. Calyptrae
campanulate, ca. 0.3 mm long. Spores
7–9 µm in diameter.