剑叶对齿藓

Didymodon handelii Broth., Symb. Sin. 4: 39. 1929. Type. China: Sichuan (Setschwan), Mu-li Co., Handel-Mazzetti 7489 (holotype H). Didymodon nodiflorus (C. Müll.) Broth., Nat. Pflanzenfam. I(3): 407. 1902. Trichostomum nodiflorum C. Müll., Nuovo Giorn. Bot. Ital., n. ser. 5: 176. 1898. Type. China: Shaanxi (Schen-si), Kuan-tou-san, Nov. 1896, P. J. Giraldi 2064 (isotype H). Didymodon sulphuripes (C. Müll.) Jaeg., Ber. Thätigk. St. Gallischen Naturwiss. Ges. 1871–72: 361 (Gen. Sp. Musc. 1: 208). 1873. Trichostomum sulphuripes C. Müll., Nuovo Giorn. Bot. Ital., n. ser. 3: 103. 1896. Type. China: Shaanxi (Schen-si), Kuan-tou-san, P. J. Giraldi 924 (isotype H).

Plants medium-sized, 20–30 mm high, dark green to reddish brown, in dense tufts. Stems erect, usually branched, densely foliate, radiculose at the base. Leaves contorted-flexuous when dry, erect-spreading when moist, ovate- to triangular-lanceolate, gradually acuminate toward the apex; margins entire, somewhat revolute; costa slender, ending just below the apex; upper leaf cells rounded quadrate to pentagonal, moderately thick-walled, unipapillose or mammillose; basal cells irregularly rectangular, smooth, hyaline. Setae straight; peristome teeth linear-lanceolate, irregularly divided to the middle; opercula conic-rostrate, with a short beak.

Type. China: Shaanxi (Schen-si), Kuan-tou-san, P. J. Giraldi 856 (isotype H).

Specimens examined: FUJIAN: Jian-ou Co., D.-K. Li 19167 (HKAS, SHM). GUANGDONG: Ding-hu Shan (Mt.), Koponen 38078 (H). HUBEI: Sheng-nong-jia (Mt.), K.-Y. Guan 80–2595 (HKAS). JILIN: An-tu Co., C. Gao 1226 (HKAS, IFSBH); Chang-bai Shan (Mt.), C. Gao 1191 (HKAS, IFSBH). LIAONING: Kuan-dian Co., C. Gao 1090 (HKAS, IFSBH). NEI MONGOL: He-lan Shan (Mt.), Z.-G. Tong 1975 (PE). SHAANXI: Qing-ling (Mt.), P.-C. Chen 217 (HKAS, PE); Tai-bai Shan (Mt.), Z.-P. Wei 6245 (HKAS). SHANXI: Wu-tai Co., D.-A. Lu 685 (HKAS). SICHUAN: Dao-cheng Co., X.-J. Li 81–7151 (HKAS); De-rong Co., X.-J. Li 81–1534 (HKAS); Gong-ga Shan (Mt.), J.-K. Yang 81–2767 (HKAS); Mu-li Co., K.-K. Chen 579 (HKAS); Wen-chuan Co., J.-X. Luo 3427 (PE). TAIWAN: Chia-yu Co., Koponen 17188 (H, HKAS). XINJIANG: Bogeda Shan (Mt.), J.-C. Zhao 2755 (HKAS); Buer-jin Co., S.-L. Chen 328 (MO, PE). XIZANG: Long-zi Co., M. Zang 1040 (HKAS); Mi-lin Co., K.-Y. Lang 625 (HKAS); Mo-tuo Co., Y.-G. Su 1089, 2221 (HKAS); Ya-dong Co., M. Zang 620 (HKAS). YUNNAN: An-ning Co., X.-J. Li 277 (HKAS); Bin-chuan Co., M.-K. Cui 475b (HKAS); Gong-shan Co., M. Zang 4662 (HKAS); Li-jiang Co., M. Zang 1783 (HKAS); Zhong-dian Co., X.-J. Li 81–1609 (HKAS). ZHEJIANG: western Tian-mu Shan (Mt.), Y.-F. Wang 466 (HSNU).

Habitat: on rotten trees or branches, also on rocks and soil walls; Distribution: endemic to China.

Illustrations: Pl. 121, figs. 1–4.