阔叶丛本藓

Anoectangium latifolium Broth. in Handel-Mazzetti, Symb. Sin. 4: 31. 1929. Type. China: Yunnan, Da-li Co., Handel-Mazzetti 6393, 8462 (syntypes H).

Plants small to medium-sized, 10–22 mm high, yellowish green to light brownish, in dense tufts. Stems simple or monopodial; in cross section outer cortical cells small, thick-walled; central strand absent. Leaves appressed to involuted or contorted distally when dry, erect-spreading when moist, lanceolate to linear-lanceolate, 1.0–1.8 mm x 0.2–0.4 mm, acuminate at the apex; margins plane, entire; costa excurrent in a short point; upper and median laminal cells irregularly rounded, 6–12 µm x 8–14 µm, rather thick-walled, with rounded pluripapillae; basal laminal cells irregularly narrow-rectangular, thin-walled, smooth, 10–26 µm x 4–8 µm, narrower and shorter toward margins, more or less with rounded differentiated area at the leaf base; abaxial superficial cells of costa above the mid-leaf linear-rectangular. Inner perichaetial leaves smaller than stem leaves. Setae 12–14 mm long, reddish brown, not twisted; capsules short-cylindrical, ca. 0.6 mm x 0.4 mm. Spores 17–20 µm in diameter.

Type. Sikkim: J. D. Hooker 203 (lectotype NY), J. D. Hooker 202 (syntype NY).

Chinese specimens examined: HENAN: Lin Co., D.-X. Ye 2a (PE). SHAANXI: Hu Co., Z.-P. Wei 4342, 4632 (HKAS), M. Wang 227, 305 (HKAS). SICHUAN: Du-kou City, K.-K. Chen 27 (HKAS): Kang-ding Co., X.-S. Duan 1164 (PE). TAIWAN: A-li Shan (Mt.), Iwatsuki & Sharp 622 (NICH); An-ma Shan (Mt.), Iwatsuki & Sharp 1342 (NICH). XIZANG: Lang-zi Co., San An Qu Lin, M. Zang 1481a (HKAS); Mo-tuo Co., Y.-G. Su 4997 (HKAS). YUNNAN: Da-li Co., Handel-Mazzetti 1138 (H); Kun-ming City, L.-S. Wang 81 (HKAS).

Habitat: on basic rocks, stone walls or in crevices, common in alpine regions; Distribution: China, Nepal, India, and Myanmar.

This species is easily differentiated from other species of the genus by having stems often more than 20 mm long, leaves flat when moist, and a more or less rounded differentiated area at the laminal base.

Illustrations: Pl. 107, figs. 1–3.