294 TAKEDA—ASIATIC POLYPODIUMS. 
24. P. pteropus, Blume. 
Another polymorphic species in respect to the dimension 
and shape of the frond as well as the arrangement of sori. The 
frond may be either simple oblong-oblanceolate, or ternate, or 
pinnatifid with a long terminal and four lateral lobes, or in rare 
cases even palmatipartite with 5 oblong lobes. The sori are 
usually irregularly scattered, but are sometimes strictly uni- 
seriate. They vary from round to oblong, and occasionally 
become confluent and grammitoid. 
The plant often grows under water: then the frond is thin 
and firm. When it grows in drier situations, the frond becomes 
to some degree thicker. 
The synonymy of this species is as follows :— 
P. pteropus, Bl. Fl. Jav. Fil. cont. p. 168, tab. 76 (1829) ; 
Hook. Sp. Fil. v, p. 75; Hook. and Bak. Syn. Fil. p. 362. 
Syn. :—P. tridactylon, Wall. List, n. 315; Benth. Fl. Hongk. 
p. 458 (1861). 
P. Hancocku, Bak. in Journ. Bot. 1885, p. 106. 
P. micropteris, Bak. in Kew Bull. 1906, p. 14. 
P. aquaticum, Christ in Nova Guinea, viii, p. 153 (1909). 
P. Hancockit was described from rather imperfect specimens. 
There are three pieces, two of which have simple, broadly 
oblanceolate, thin fronds with scattered sori, while the third 
is much larger and pinnatipartite with 5 lobes. This last- 
mentioned specimen is, unlike the typical P. pteropus, thick 
in consistency, but this may be due to the habitat. This 
third specimen is also much damaged by some external injury. 
The writer cannot help thinking that it is an abnormally 
thick-leaved specimen of P. pteropus. 
P. micropteris, Bak. represents the simple-leaved form of this 
species which has been known as P. pteropus var. minor, Bedd. 
(Handb. p. 361). 
The writer has been unable to find any distinction between 
P. aquaticum, Chr. and the typical P. pteropus. 
The present species is widely distributed over India (Bhotan, 
Nepal, Assam, etc.), Ceylon, Malaccas, Philippines, Java, 
Sumatra, Hongkong, $.W. China, and Formosa. The following 
specimens from China and Formosa have been examined :— 
CHINA. Yunnan: Szemao, E. mts., 6000 ft., in shade in forest 
Se 12,630 *) ; Kwangsi: Lungchow, in wet ravine (Morse, 
n. 54). 
Honexonc. (Harland, 1857; Champion, n. 302; Wilford, 
45)- 
_* The type specimen of P. micropieris, Bak. 
