g6 NEW YORK STATE MUSEUM 



tinct encrusted cystidia in the hymenium and in the absence of 

 cross walls and clamp connections on the hyphae. That species 

 also has the small ellipsoidal spores and rhizomorphic strands of 

 P o r i a m y c e 1 i o s a . One collection made on August 17th, at 

 Floodwood, N. Y., by Peck and referred by him to P o r i a f i m - 

 b r i a t e 1 1 a belongs to the species under discussion, as does also 

 a collection from the Catskill mountains labeled by him as Poly- 

 porus vaillantii. Both of these may have been prior col- 

 lections, but the absence from the data of the year of collection 

 obscures this point. A specimen has recently been received from 

 E. T. Harper, collected on hemlock wood at Frankfort, Mich., 

 August 1908. 



The characteristic features of the species appear to be the thin 

 separable growth with short tubes and rhizomorphic strands, and 

 the small spores. The writer's interpretation of Poria vail- 

 lantii (DC.) Fries, calls for a similar plant, but one that is pure 

 white in color, and with quite different spores. 



The collections so far examined have been from very rotten wood 

 and no definite statements can be made regarding the nature of 

 the decay produced by the fungus. 



Redescription. Effused, 2 to 12 cm broad, separable, with a broad, 

 white, sterile, fimbriate margin often ending in small rhizomorphic 

 strands that follow the surface of the substratum or become 

 embedded in it; subiculum exceedingly thin, white, scarcely dis- 

 cernible in mature specimens ; tubes scarcely .5 mm long and often 

 considerably shorter, first appearing as shallow depressions in the 

 subiculum, their mouths pale yellow when fresh (fide Peck), becom- 

 ing pinkish buff to cinnamon buff in herbarium specimens, angular, 

 thin-walled, often dentate, averaging about 3 to a millimeter but 

 occasionally more or less confluent and up to 1 mm in diameter; 

 spores ellipsoidal, smooth, hyaline, minute, 2.5 to 4 x 2 /*; basidia, 

 2 to 3 /x in diameter ; cystidia none ; tramal tissue rather open, com- 

 posed of thin-walled, colorless, branched hyphae, 2 to 3.5 fi in 

 diameter, the branching more or less right angled ; clamp connec- 

 tions abundant. 



On well-rotted hemlock wood. 



Type locality: Floodwood, N. Y. C. 11. Peck. Also known 

 from Michigan. 



