ICONES FILICUM) SINICARUM; 
PLATE 227 
ADIANTUM MYRIOSORUM Baker 
ADIANTACEE 
ADIANTUM MYRIOSORUM Baker in Kew Bull. Misc. Inform. 1898: 230; Ching in Bull. Fan 
Mem. Inst. Biol. Bot. Ser. 11: 54. 1941 cum descr.; in Acta phytotax. Sinica 6: 324. 1957. 
Adiantum pedatum L. var. myriosorum Christ in Bull. Herb. Boiss. II. 1903: 511; in. Bull. Soc. Bot. France 
52: Mém. I. 111, 510. 1905. 
Adiantum pedatum (non L.) Diels in Bot. Jahrb. 29: 200. 1900; Christ in Bull. Soc. Bot. France 52: Mém. 
I. 62. 1905; in Bot. Gaz. 51: 346. 1911; C. Chr. in Acta Hort. Gotheb. 1: 95. 1924; Hand-Mzt. Symb. 
Sin. 6: 38. 1929 (pro parte). 
Adiantum pedatum L. var. glaucinum Christ in Bull. Herb. Boiss. 6: 957. 1898; C. Chr. in Contr. U. S. 
_ Nat. Herb. 26: 310. 1931. 3 
Adiantum pedatum L. var. protrusum Christ in Bull. Acad. Géog. Bot. Mans. 1904: 110. 
Rhizome strong, thick, woody, oblique, densely clothed at growing apex in dark brown, firm, lanceolate, 
acuminate, entire scales; fronds caespitose, a few together, erect, stipe 12-25 cm long, stout, ebeneous, highly 
polished, terete, glabrous above the base, lamina 25-35 cm long and as broad, forked from the top of stipe 
under ‘an acute angle into two spreading, curved, flexuose lateral branches, from the upper side of which 
spring 36 equally spaced, simply pinnate, linear-lanceolate upright pinnae on each side of the two equal 
halves, the two central pinnae much the longest, 25-35 cm long, the others gradually shortened as they go 
outwards, with the outermost (the terminal) pinnae 7-10 cm long and spreading; the central pinnae 3-3.5 
cm broad, with numerous (to 45 pairs), close, pectinate, horizontally patent, triangular, dimidiate and petio- 
lulate pinnules, 1.2-16 cm long, 7 mm broad at the upper-inner, straight or oblique base, the lower edge 
cut straight, the upper edge also straight and serrate under the acute apex, which is always provided with 
35 rather sharply deltoid teeth, the upper pinnule gradually smaller below the small narrowly fan-shaped 
terminal one, the pinnules of the outer pinnae being similar but decreased in number, and the outermost 
pinnae consisting of only about 10-15 pinnules; texture herbaceous, green above, glaucescent below, gla- 
brous in all parts; veins fine and distinct, one to each apical tooth; sori roundish or transversely reniform, 
attached to shallow sinuses, 4-5 along the upper edge of each pinnule, separated by a notch, indusium dark- 
colored with broad, pale-colored membranaceous margin; spores sharply tetraedric, pale-brown, transluscent 
and smooth. 
A distinct and pretty fern endemic in Southwest China: Szechuan (Mt. Omei), Kweichow, Western 
Hupeh and N.W. Yunnan, where the fern is locally abundant under forests at elevations from 1000-1500 m. 
In general habit this species exactly resembles Adiantum pedatum L. of Northeast Asia and North 
America, to which it was previously reduced as a synonym or a variety, but it differs in the almost black 
stipe, glaucescent underside of fronds, decidedly triangular pinnules invariably provided with 36 rather 
sharply deltoid teeth at the acute or blunt apex and with serrate upper margin, the generally roundish and 
more numerous indusia to each pinnule and in the dark brown, g 
lossy, narrower, firmer scales on rhizome. 
It grows at a lower elevation. 
Plate 227. 1. Habit sketch (natural size). 2. Fertile pinna (X 3). 
3. Sterile pinna, showing serrate upper 
margin (X 3). 4. Scale from the base of stipe (X 20). 
5-6. Sporangium with spores (xX 100). 
