POLYPORACE^E 
97 
dead oak stumps and trunks, particularly the cut surface of 
stumps remaining where trees have been felled two or three 
years previously, occasionally appearing on squared timber. 
Has been found in peat beds and lake-side pile-dwellings. 
Very common. 
TRAMETES 
(From the generic distinction depending on the trama) 
T. gibbosa ( gibbus , gibbous—from its thickness and con¬ 
vexity). Plate XXXII. 9. 
P. 1-6 in., concentrically zoned, minutely velvety, white, 
greyish with age ; sometimes green, owing to the presence of 
a minute alga in the velvet. F. white and corky. Por. 
about J in. deep, radially elongated, straight except at the 
base, where they are usually roundish or irregular, pale tan. 
Stumps, posts, etc., throughout the year. Not common. 
T. Bulliardi (after Pierre Bulliard) is frequent on decaying 
alder. 
P. and Pov. whitish at first, becoming brown at maturity. 
If touched with ammonia, the pores instantly assume a 
beautiful but evanescent pink colour. 
PORIA 
(From the porous hymenium) 
P. vaporaria (vaporarium, a stove—perhaps first observed in 
a hot-house). Plate XVI. 3. 
Por. large, angular, whitish at first, then cream-colour. 
Forming broadly effused, thin, inseparable patches (up to 
4 in. diam.) on dead trunks and branches, and on wounded 
surfaces of living branches, the white mycelium penetrating 
the bark. Said, by Hartig, to be very destructive in 
Germany to living spruce and pine, and having as bad a 
reputation as the “ Dry-Rot ” fungus. Common throughout 
the year. 
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