NATURAL HISTORY SURVEY 119 



On decayed fallen branches, Glencoe. November. The plants 

 project 3 or 4 cm. and are laterally confluent. The pore surface 

 is very irregular and uneven. When old, the pores are lacerated 

 so that the fungus has the appearance of an Irpex. 



Polystictus hirsutus Fr. 



Pileus unicolorous, but zoned with concentric furrows, whitish, 

 corky-coriaceous, convex-plane, shaggy with rigid hairs. 



Pores round, obtuse, whitish, becoming somewhat fuscous. 



On trunks, branches, stumps, etc. Common. Pileus 4 to 9 

 cm. wide, projecting 3 to 6 cm., dimidiate, reniform, often imbri- 

 cated and laterally concrescent, sometimes orbicular and attached 

 by the vertex, rarely proliferous, new pilei developing from the 

 margins of those of the preceding season. The pileus is in the 

 main uncolorous, but the zones near the margin are sometimes 

 darker than those of the older portions of the plant. - The color 

 may be whitish, pallid gray, cervine, or even cinnamon-brown. 

 The contex is pure white, soft-corky in texture. The pores 

 become yellowish, ochraceous, grayish, fuscous, or even brownish- 

 slate-color, and are paler toward the margin of the pileus. Their 

 diameter is about J mm. 



PORIA. 



Sporophore entirely resupinate, indefinitely spreading; pileus 

 very thin or none (i. e., tubes seated on a thin layer of mycelium), 

 waxy, leathery or membranaceous. 



Broadly expanded, more or less fleshy, soft 1 



Effused, coriaceous, dry, tough 5 



1. Pores minute, equal, round 2 



1 . Pores medium or large, unequal, subangular 4 



2. Pores white becoming pallid 3 



3. Plant growing in interior of hollow 



trunks P. internet. 



3. Plant growing on rotten wood, border 



byssine P. mollusca. 



3. Plant growing on fallen branches, border 



fimbriate-cUiate P. fimbripora. 



2. Pores white, then bright buff, border minutely 



downy P. armeniaca. 



2. Pores white then yellowish, border slightly 



marginate P. medulla-panis. 



2. Pores white then pale tan, odor subacid ... P. subacida. 

 2. Pores white then ochraceous-pallid ; incrusting 



minute P. obducens. 



2. Pores pinkish-ochre, border whitish P. attenuata. 



4. Pores pure white P. candidissima 



4. Pores white becoming pale brown P. vaporaria. 



4. Pores salmon becoming purple-brown .P. salmonicolor. 

 Pores rather large, white then yellowish. . .P. serena. 

 Pores minute, pallid then rich cream-color. .P. xantholoma. 



