CEYLON POLYPORl. 
135 
Poria interrupta B. & Br. 
Poria vulgaris Fr., in B. & Br., Fungi of Ceylon, 498. 
White, becoming buff or pinkish-buff, with a white 
byssoid margin, which appears pulverulent. Margin 
thin. Pores at first tomentose, becoming glabrous or 
nearly so, rigid, subhexagonal, 0* 1-0* 15 mm. diameter, 
with a few larger scattered pores up to 0* 3 mm. Con- 
text thin, fibrous, white or yellowish ; total thickness 
0*5-1 mm. Frequently developing in small circular 
patches which subsequently become confluent. 
Frequent on dead mango branches at Peradeniya. 
3479, 3480, Peradeniya, May, 1912 ; 4224, Peradeniya, 
October, 1914 ; 4282, Peradeniya, November, 1914 ; 
4668, Hakgala, April, 1915. 
Poria Ravenalæ B. & Br. 
2187, Peradeniya, February, 1907, &c. 
Pale slate-gray, with a narrow paler or white margin ; 
widely effused in patches up to 24 cm. long ; very thin, 
total thickness up to 0*2 mm. Pores angular, 0*1- 
0*25 mm. diameter ; dissepiments thin, rigid. 
Common on dead petioles of palms, palm stems, &c. 
I have not seen it on Ravenala. It turns black when 
old, or when pickled with mercuric chloride in alcohol. 
Poria Vaillantii Fr. 
2235, Kandapola, May, 1906. 
The Ceylon fungus spreads over rotten wood or bare 
ground by coarse white rhizomorphs, which expand 
and unite into sheets bearing the hyménium. These 
sheets are up to 7 cm. long and 3 cm. broad, and are 
completely covered with pores, except at the membra- 
nous edges. The pores are small, angular, with thin 
dissepiments when dry, and are up to 3 mm. deep. The 
whole fungus is white. 
The Ceylon form appears to differ from the European 
species in its greater development of the hyménium. 
I have left it under Berkeley and Broome’s name, as 
it is probable that Poria leptoderma will prove to be an 
immature form of the same thing. 
