4. Homomallium mexicanum Card. 墨西哥毛灰藓 mo-xi-ge mao hui xian
Rev. Bryol. 37: 53. 1910. Type: Mexico. Hidalgo, Pringle s.n.
Plants small, green or yellowish green. Stems creeping, irregularly or subpinnately branched; branches short, erect, sometimes slightly curved at apex. Leaves erect-spreading, 0.8–1.3 mm long, ovate-lanceolate, somewhat suddenly narrowed to slender apex, concave; margins plane, indistinctly serrulate or nearly entire, usually recurved near leaf base; costae double, short; median and upper leaf cells narrowly rhomboidal, smooth, somewhat thick-walled; alar cells in 4–5 rows, with ca. 22 cells extending along the margins. Autoicous. Setae ca. 1.0–1.6 mm long, yellowish or reddish-orange; capsules nearly erect, oblong-ovoid, ca. 1.0–1.5 mm long, slightly curved when dry; opercula conic, shortly rostrate; peristome double; endostome segments not perforate; cilia 1–2, longer than teeth. Spores 11–14 µm in diameter, smooth or minutely papillose.