[Vol. 13 

 324 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



1897. Hydnum viride (Alb. & Schw.) Fries, Syst. Myc. 1: 421. 

 1821; Hym. Eur. 614, 1874. 



This species has hypochnoid texture, color deep grape-green at 

 first, fading to Vetiver green in the herbarium, and minutely 

 echinulate spores slightly colored, about 3}^-5 x 3-3}^ jx. I 

 have seen American collections from Vermont, Missouri, and 

 British Columbia. The fructifications are sometimes so even 

 that they might be referred to Hypochnus. 



PENIOPHORA 



Peniophora populnea (Peck) Burt, n. comb. 



Stereum populneum Peck, N. Y. State Mus. Rept. 47: 145. 

 1894. 



Type: in N. Y. State Mus. Herb, and Burt Herb. 



Fructifications effused, often confluent, adnate, rather thin, 

 small pieces separable when moist, brown tinged with liver color 

 when fresh, becoming between Natal brown and Mars brown in 

 the herbarium, not shining, somewhat colliculose, contracting in 

 drying and cracking into angular masses Yt^-Vi m:m ' "* diameter, 

 the margin thin, radiate-dentate, pale, drying slightly free in 

 some places; in section 250-300 [l thick, colored, 2-layered, with 

 a broad layer next to the substratum composed of longitudinally 

 arranged, crowded and densely interwoven, nearly hyaline hyphae 

 23^-3 (x in diameter, and with an equal, colored hymenial layer 

 composed of erect, densely crowded and interwoven, brownish 

 hyphae and brownish paraphyses and cystidia; no gloeocystidia; 

 cystidia heavily incrusted, very large, up to 60-100 X 20-25 (i, 

 at the surface of the hymenium but not protruding; paraphyses 

 hair-like, colored, slender, 1-1 3^ ja in diameter, branching at or 

 near the tips into 2 or 3 short branches; basidia cylindric, 70- 

 90 X 3-4 n, probably simple and with 4 very short sterigmata; 

 spores hyaline, even, 12-15 X 4 p. 



Fructifications 3^ cm. long, 3 cm. wide. 



On bark of decaying Populus tremuloides. New York. 

 August. 



P. populneum should be recognized by its occurrence on poplar 

 logs, liver color externally and colored substance, cracked hy- 

 menium, very large cystidia, and long and slender basidia. The 



