29. Bryum pallens Swartz 灰黄真藓 hui huang zhen xian
Monthly Rev. London 34: 538. 1801. Bryum intermedium var. pallens (Swartz) Hartman, Handb. Skand. Fl. (ed. 3) 2: 296. 1896. Type: Europe.
Bryum appendiculatum Amann, Bull. Soc. Vaud. Sci. Nat. 53: 95. 1920.
Bryum exstans Mitt., J. Proc. Linn. Soc., Bot., Suppl. 1: 72. 1859.
Plants small, 5–10 mm high or higher, mostly green, or brown to more or less reddish, in loose or dense tufts. Stems reddish, more or less branched, with rhizoids at base. Lower leaves small, sparse; upper leaves larger,
dense, erect or slightly twisted; stem leaves rounded-ovate to oblong-ovate, 1.5–2.2 mm long, shortly acuminate; margins slightly recurved, entire; branch leaves oblong-elliptical to ovate, ca. 1.2 mm long; costae slender, percurrent or excurrent; median leaf cells lax, hexagonal, 45–72 µm × 14–26 µm, becoming slightly narrower near margins, bordered by 1–2 rows of linear cells, thin-walled; basal cells rectangular or hexagonal, smaller than the median cells. Dioicous. Setae ca. 20 mm long, reddish brown, curved above; capsules oblong-pyriform, inclined to pendulous, ca. 4.0–4.5 mm long, yellowish brown; neck developed, as long as urn; opercula conic, apiculate; exostome teeth slightly yellowish below, hyaline above; endostome segments widely perforate; basal membrane ca. 1/2 the height of teeth; cilia 2, as long as the segments, appendiculate. Spores 12–18 µm in diameter.