毛口藓

Didymodon brachydontius (Bruch in F. A. Müll.) Wils. in Hook., Brit. Fl. (ed. 4) 2: 30. 1833. Tortula brachydontia (Bruch in F. A. Müll.) Mitt., J. Linn. Soc., Bot. 12: 148. 1869. Mollia brachydontia (Bruch in F. A. Müll.) Lindb., Musci Scand. 21. 1879. Tortella brachydontia (Bruch in F. A. Müll.) Jens., Danmarks Mosser 2: 320. 1923. Trichostomum brachydontium var. esquirolii (Thér.) P.-C. Chen, Hedwigia 80: 171. 1941. Trichostomum esquirolii Thér., Bull. Acad. Int. Geogr. Bot. 18: 251. 1908. Type. China: Guizhou (Kweitschow), Qung-mou, 1905, Esquirol s.n. Trichostomum brachydontium subsp. mutabile (Bruch in De Not.) Giac., Atti Ist. Bot. “Giovanni Briosi”, sér. 5 4: 204. 1947. Trichostomum mutabile Bruch in De Not. Syllab. Musc. 192. 1838. Weissia periviridis Dix., Hong Kong Naturalist, Suppl. 2(9): 1933. Trichostomum brachydontium var. eubrachydontium (Bruch) P.-C. Chen, Hedwigia 80: 169. 1941, nom. illeg. Type. China: Fujian (Fukien), Amoy, 11 VII 1931, Herklots 18b.

Plants small to medium-sized, 1.5–2(–3) cm high, yellowish green to light brown, in loose tufts. Stems erect, simple or usually irregularly branched. Leaves crisped when dry, erect-spreading when moist, narrowly lanceolate, broadly acute to rounded-obtuse, mucronate; margins entire, more or less plane; costa stout, excurrent as an apiculus; upper leaf cells rounded-quadrate, moderately thick-walled, green and obscure, each cell with several large, circular papillae on both surfaces; basal cells slightly elongate, irregularly rectangular, yellowish, smooth. Dioicous. Setae 10–12 mm long; capsules erect, oblong-ellipsoidal; peristome teeth erect, linear, irregularly 2–3-divided, finely papillose; opercula conic-rostrate, with a long beak.

Type. Europe.

Chinese specimens examined: ANHUI: Huang Shan (Mt.), P.-C. Chen 7412 (PE); She Co., P.-C. Chen 6486 (PE). FUJIAN: Wuyi Shan (Mt.), P.-C. Chen 74 (PE). GUANGDONG: Ding-hu Shan (Mt.), H. Wu 153 (PE). GUIZHOU: Gui-yang City, X.-J. Li 187 (HKAS). HEBEI: Long-guan Co., K.-J. Guan 4314 (MO, PE). HEILONGJIANG: Jing-bo-hu (Lake), C. Gao 9023 (HKAS, IFSBH). HENAN: Hui Co., H.-J. Yu 1012 (PE). JIANGSU: Nan-jing City, M. Zang 5501 (HKAS). JILIN: Chang-bai Shan (Mt.), C. Gao 1227 (HKAS, IFSBH). LIAONING: Kuan-dian Co., C. Gao 8088 (HKAS, IFSBH); Shen-yang City, C. Gao 1205 (HKAS, IFSBH). SHAANXI: Zhou-zhi Co., Lou-guan-tai, Q-M. Li 21 (PE). SHANGHAI: She Shan (Mt.), S.-M. Xu 511 (PE). SHANXI: Ning-wu Co., Z.-R. Wang 4 (PE). SICHUAN: Bei-pei Co., P.-C. Chen 583 (PE): Chong-qing City, P.-C. Chen 4787 (PE); Jiang-bei Co., P.-C. Chen 5164 (PE); Omei Shan (Mt.), Redfearn 33371 (MO); Nan-ping Co., Redfearn 35414 (MO). TAIWAN: Ali Shan (Mt.), Iwatsuki & Sharp 244 (NICH); Anma Shan (Mt.), Iwatsuki & Sharp 2621 (NICH). Xizang: Mo-tuo Co., Y.-G. Su 2036 (HKAS); Ya-dong Co., M. Zang 255a (HKAS). YUNNAN: Qiu-bei Co., X.-J. Li 187 (HKAS). ZHEJIANG: Sui-chang Co., Z.-L. Liu 1095 (HSNU); western Tian-mu Shan (Mt.), R.-L. Hu 78 (HSNU, MO).

Habitat: on rocks, forest ground, grasslands, or thin soil over rocks; Distribution: China, Japan, western Asia, Russia, Europe, northern Africa, and North and South America.

Illustrations: C. Gao (ed.) 1996 (Pl. 56, figs. 10–15).