' ICONES FILICUM SINICARUM 
PLATE 225 
ADIANTUM DIAPHANUM Blume 
ADIANTACE 
ADIANTUM DIAPHANUM Blume, Enum. PI. Javae 215. 1828; Hook. Sp. Fil. 1:10 t.80 C. 1851; Hook. 
& Bak. Syn. Fil. 117. 1867; Benth. Fl. Austr. 7: 725. 1878; Diels in Engl u. Prantl, Nat. Planzenfam. 
1: iv. 286. 1899; C. Chr. Ind. Fil. 25. 1905; Copel. Polyp. Phil. 93. 1905; Matsum. et Hayata, Enum. 
Pl. Form. 617. 1906; v. A. v.R. Handb, Mal. Ferns 323. 1908; Ogata, Ic. Fil. Jap. 6: t. 251. 1935; Tagawa 
in Journ. Jap. Bot. 14: 393. 1938; Tard. et C. Chr. in Fl. Gen. Ind. 7: 183. 1940; Ching in Acta Phytotax. 
Sinica 6: 321. 1957. 
Adiantum setulosum J. Sm. in Bot. Mag. 72: Comp. 22. 1846. 
Adiantum affine Hook. Sp. Fil. 1: 32. 1851 (non Willd.). 
Rhizome short, erect, densely radicose, moderately clothed at the apex in reddish-brown, small, lanceo- 
late-acuminate, entire scales; fronds fasciculate, stipe 10-18 cm long, erect, polished, wiry, nearly black, 
sparsely scaly near the base but glabrous upwards, with a broad groove on the upper side, lamina as long 
as the stipe, varies from linear-lanceolate and simply pinnate to bipinnate at the base with 13 additional 
stalked simply pinnate shorter pinnae, 2-3 cm broad, apex bluntly acuminate; pinnae in the main central 
branch numerous, contiguous, oblique, shortly petiolate, 1-2 cm long, 7-10 mm broad, dimidiate, subrhom- 
boidal, the lower edge quite straight, the inner truncate or slightly recurved, the outer roundish or oblique 
and crenate like the upper edge with round entire teeth (in the soriferous pinnae), or dentate (in the sterile 
pinnae); texture thin, nearly pellucid, dark green, dry opaque green, rachis glabrous, with moderate red- 
dish-brown appressed bristle-like unicellar hairs between the veinlets on the under side of pinnules; veins 
distinct, glabrous; sori small, round-reniform, indusium dark-colored, coriaceous, attached to the deep narrow 
sinuses, 5-8 round the outer and upper edge, distant. 
Hainan: Five Finger Mt. Mrs. Eryl Smith 1471,.1464; Tsang and Tung 17829 ex Herb, Lingnan 
Univ.; Mei Hsien, Yam Na Shan, W. T. Tsang 21556. Fukien: Foochow, Forbes 2487; H. H. Chung 
3798, August 18, 1925; Minchow, H. H. Chung 2292; Amoy, Swinhoi in Herb. Hance (1857); Hance 
1411; Inghock, H. H. Chung 1340, 2634, June 14, 1923; Yung-chung, Rankin (1913); Hinghwa, Lin Pi 
6538; Lien-kiang Hsien, D. C. Liu 84; Nan-tsin Asien, H. C. Chao F22, April 20, 1954. Taiwan: Hancock 
35; Suzuki-Tokio 20920, Nov. 16, 1940 under forest, alt. 650 m. 
A widely dispersed species in the tropics and subtropics in Asia, Polynesia, Australia and New Zealand. 
A very distinct species not easily to be confounded with any other Chinese species of the genus perhaps 
except 4. pubescens Schkuhr., which has dichotomously forked fronds and densely pubescent stipe and 
lamina. The species is further differentiated from its relatives in having stipe broadly grooved on the 
upper side (not terete) and the sporangia borne on the veinlets as well 
as on the parenchymatic tissues 
between the veinlets. 
There is a form in Malaysia having lamina devoid of the characteristic hairs on the under side and 
dry olive-green; it is called var. affine vy. A. v.R. (I.c.), and is also kno 
wn from Hainan and Fukien (C. 
Wang 35202, 35784 from Hainan; Tang Siu Ging 16359 from Hok- 
chiang, Fukien). 
Plate 225. 1. Habit sketch (natural size). 2. Fertile pinna (X 3). 
(X 3). 4. Cross section of the basal part of stipe (greatly enlarged). 
6. Hairs from the under side of lamina (X 100). 
3. Sterile pinna, showing dentate margin 
5. Scale from the base of stipe (X 60). 
: 7. Under side of indusium, showing the distribution of sporangia 
and hairs (X 10). 8-9. Sporangium with spores (xX 100). 
