ICONES FILICUM SINICARUM 
PLATE 67 
LEPISORUS CLATHRATUS (Clarke) Ching 
POLY PODIACEAE 
LEPISORUS CLATHRATUS (Clarke) Ching, Bull. Fan Mem. Inst. Biol. 4: 71 (1933). 
Polypodium clathratum Clarke, Ferns N. Ind. in Trans. Linn. Soc. ser. 2. Bot. 1: 559 pl. 82 
f. I (1880); C. Chr. Ind. Fil. 517 (1906). 
Polypodium Alberti Regel, Acta Horti Petr. 7: 622 (1881). 
Pleopeltis clathrata Bedd. Handb. Fern Brit. Ind. 348 (1883). 
Polypodium Uchiyamae Makino, Tokio Bot. Mag. 20: 30 (1906); Ogata, Ic. Fil. Jap. 2: pl. ot 
(1929), teste Takeda. 
Polypodium Soulieanum Christ, Bull. Soc. Bot. France 52: Mém. 1. 15 (1905). 
Polypodium lineare var. abbreviatum Christ, Bull. Acad. Géogr. Bot. (1902) 153. 
Rhizome quite thick, creeping, hypogaeous, densely scaly; scales ovate-acuminate 
fuscous, thin, with some long-protruding teeth on the margin, coarsely clathrate with 
large, uniform, isodiametrical and more or less iridescent luminae; frond linear-lanceo- 
late, generally 10-15 cm long, 1-1.3 cm broad, or sometimes much reduced, gradually 
attenuate towards the slender, pale straminous, and rather long stipe, leaf-apex blunt or 
subacute, or rarely subacuminate, margin entire, plane, or sometimes slightly wavy; texture 
thin herbaceous, color light green, underside with a few similar scales at first; venation 
distinct;sovi medium-sized, rounded, medial. 
Yunnan: Hokin, Delavay 1716. Kan-su: Choni, Purdom 1965; near Pin-fan, R. C. 
Ching 571, July 20, 1923. Shensi: Thae-pei Shan, Givaldi, August, 1890; Purdom 96, 
1065; K. S. Hao 4414, 4470, Sept. 20, 1932. Hopei: Peiping Mountains, Hancock 9, 17 
(1876); Siawutai Shan, C. T. Li 2484, August, 1932; ibid. H. W. Kung 1201, Sept. 9, 
1930. Shansi: Koti Shan, W. Y. Hsia 1751, Sept. 7, 1929; Tawutai Shan, T. H. Serre 
2335 (1929); Suiyuen, Halachingkow, Tatsin Shan, W. Y. Hsia 2855, July 24, 1931. 
Szechuan: Tatsienlu, Sowlié 759 (1893); Sung-pan, H. Smith 4082, 2536, 2726; Chen- 
chiang-kuan, H. Smith 2609; Dongrergo, H. Smith 8615; Drogochi, H. Smith 
4470. 
Thian-shan: H. Appelton 580 (1908). Turkestan: Fetosson. 
Distr: Turkestan, Afghanistan, Kashmir, Nepal to W. and N. W. China, Siberia, 
Thian Shan, Japan and Loo-choo Islands (fide Takeda). 
Although quite variable in size, this fern can always be distinguished from 
others by its hypogaeous rhizome, thin herbaceous, green leaves with rather 
distinct venation, and very characteristic fuscous, clathrate, iridescent scales on 
rhizome and sori. 
Plate 67. Fig. 1. habit sketch (natural size). 2. portion of a lamina, showing venation and 
position of sori (x2). 3. scale from rhizome (X50). 
