108 NEW YORK STATE MUSEUM 



except under rigid inspection. In several mounts made of the 

 hyphae the peculiar origin of the basidia as illustrated for P o r ia 

 griseoalba was not seen. 



From several references already made to P o r i a g ri s e o- 

 a 1 b a it may be inferred that propably Poria semitincta is 

 most closely related to that species. Microscopically the two species 

 are difficult to separate unless the shape of the apparently mature 

 spores, the nature of the origin of the basidia, and the absence in 

 the latter species of the very short hyphal cells be regarded as indi- 

 cating specific difference. In the former species the mature spores 

 are decidedly allantoid and several times longer than broad, while 

 the only spores observed in Poria semitincta were not at 

 all allantoid. Microscopically the two species are somewhat similar 

 in some specimens but in others there is less resemblance. Both 

 are quite thin and light colored when fresh, but the lilac tinge to 

 the subiculum should facilitate their separation in the field. Poria 

 m y c e 1 i o s a and Poria fimbriatella are also some- 

 what similar. The latter species may easily be distinguished by the 

 presence of cystidia. The former species has shorter and smaller 

 spores, hyphae 2.5 to 3.5 fx in diameter, and with clamp connections. 



No information can be gathered from Peck's collections as to the 

 nature of the decay produced by the fungus. 



Redescription. Annual, separable, not broadly effused, with a 

 white, tomentose, sterile margin from which a few rhizomorphic 

 strands are rarely produced ; subiculum very thin, noticeable only 

 on the margin, white or with a tinge of lilac in fresh specimens 

 (fide Peck) ; tubes less than .5 mm long, meruloid in dried speci- 

 mens, whitish or pale-cream color when fresh (fide Peek), avel- 

 laneous to pinkish cinnamon in herbarium specimens, or a light 

 vinaceous shade rarely persisting, the mouths subrounded, averag- 

 ing 3 to a millimeter ; dissepiments thin, entire but often uneven ; 

 spores oblong or short cylindric, hyaline, 3 to 4 x I to 2 fi; basidia 

 2 to 3 ix in diameter ; cystidia none or at least very inconspicuous ; 

 trama and subiculum rather open, of loosely arranged, hyaline, 

 flexuous, branched hyphae 4 to 7 //. in diameter; cross walls promi- 

 nent ; clamp connections absent. 



On chips of maple (Acer) and perhaps woods of other deciduous 

 trees ; sometimes overrunning leaves. 



Type locality : Griffins, N. Y. C. H. Peck. Also collected by 

 Peck at South Bethlehem, at Ballston, and at Lyndonville. 



