TAKEDA—ASIATIC POLYPODIUMS. 281 
in size. The smallest one examined does not exceed ro cm. in 
length, while the largest one would reach 40 cm. The width 
also varies from less than a centimetre up to over 4 cm. It is 
almost impossible to distinguish different varieties or forms 
based on the dimensions of the frond. The ramenta in the 
var. bicolor give a peculiar appearance, somewhat resembling 
those in P. sinuosum. This variety is found in China, together 
with the typical form, and also occurs in India.* The following 
specimens from China have been examined :— 
a. concolor :— 
Yunnan: Szemao, W. mts., 6000 ft. in forests, on trees (Henry, 
n. 13,070A) ; Mengtsz, N. mts. forests, on tree, 8500 ft. (Henry, 
n. 10,087), on wind-blown rhododendron trunk at 6000 ft. (Han- 
cock, n. 104). Tibet: Yatung (Hobson, 1897). 
8. bicolor :— 
W. China: without locality (Wilson, n. 5317, 53174); 
Hupeh: Patung District (Henry, n. 1739, 2465); Yunnan: 
Mengtsz, N. mt. forests, 8500 ft., on tree (Henry, n. 10,088 ¢) ; 
Montagne de Mao ku chang (Delavay, Jul. 1883). 
Any information as to the occurrence of this species in Japan 
does not apply to this fern, but to P. annuifrons, Makino.{ 
to. P. annuifrons, Makino.§ 
Although this species has been taken for P. excavatum,|| it is 
not closely akin to that plant. The frond is thin, chartaceo-cori- 
aceous, slightly repand on the margin, and the veins and venules 
are hidden. Unlike those of P. excavatum, the sori are round 
and, when young, covered with small peltate scales with black 
reticulation. They also do not reach more than half-way down 
the frond. The ramenta on the rhizome show quite a distinct 
feature ; they are ovate-lanceolate, acuminate, laciniato-denti- 
culate, and are marked with black reticulation. 
This species is exclusively Japanese, being widely distributed 
over various parts of the country. According to Christensen,{ 
it has also been found in Quelpart, the flora of which possesses 
a large proportion of Japanese elements. 
11. P. clathratum, C. B. Clarke. 
The extremely thin texture of the frond and the char- 
acteristic clathrate scales in the sorus and on the rhizome 
* Kumaon (Strachey and \dnantstio n. 2); Darjiling (Griffith). 
+ Christ has erroneously determined this number to be P. oligolepedum, Bak. 
See Bull. Herb. Boiss. vi, p. 875 (189 8). t Cf. the present paper, p. 306. 
Phan. Ao Japon. Ic. Ill. i, ek tab. vii (1899); Id. in Tékyé Bot. Mag. 
xiii, p. 48 (1899 || Christ in Bull. | Boiss. vi, p. 673 (1896). 
§ Bull. Hie Intern. Geogr. Bot. xxi, p. 72 (19 
