11b. Fissidens crispulus Brid. var. robinsonii (Broth.) Z. Iwats. & Z.-H. Li, stat. nov. 黄叶凤尾藓鲁宾变种 huang-ye feng-wei xian lu-bin bian-zhong
Fissidens robinsonii Broth., Philipp. J. Sci. 13: 204. 1918. Type. The Philippines: Mindanao, W. I. Hutchinson 7607 (lectotype H-BR); Panay, Iloilo Prov. Robinson 18105 (isolectotype H-BR).
Plants yellowish green, brownish when old and forming dense tufts. Leafy stems usually creeping, simple or with innovations from axils of upper leaves, 7–18 mm long, 2.5–3.4 mm wide; axillary hyaline nodules well differentiated; central strand differentiated. Leaves in 13–45 pairs, densely arranged, the lowermost leaves much smaller than the leaves above; middle to upper leaves narrowly lanceolate, 1.5–2.4 mm × 0.25–0.40 mm, narrowly acute at apex; base of dorsal laminae rounded; margins finely serrulate; vaginant laminae ca. 3¤5 the leaf length, almost equal; costa stout, shortly excurrent; cells of apical and dorsal laminae rounded-quadrate to rounded-hexagonal, 7.0–10.5 µm long, thick-walled, mammillose, walls clear; cells of vaginant laminae similar to those of apical and dorsal laminae, but with thicker walls, cells of extreme base of vaginant laminae larger, sub-quadrate, thick-walled. Dioicous. Female inflorescences terminal. Perichaetial leaves larger than stem leaves. Archegonia ca. 300 µm long. Sporophytes not seen.