[Vol. 12 

 238 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Fructifications received in fragments but probably about 1-3 

 cm. in diameter. 



On ground in mixed woods. New York and Louisiana. April 

 and June. 



The fructifications of P. terricola contain so much of the sand 

 from the earth substratum that it is difficult to secure sections 

 or to distinguish the fructification proper from its vegetative 

 mycelium. The occurrence in small white patches on the ground, 

 and the characters of spores and cystidia may enable recognition 

 of this species which is probably common. 



Specimens examined: 

 New York: Ithaca, G. F. Atkinson, 22658, 22659, type. 

 Louisiana: St. Martin ville, A. B. Langlois, bq. 



22. P. magnahypha Burt, n. sp. 



Type: in Mo. Bot. Gard. Herb, and Farlow Herb. 



Fructifications interruptedly effused, thin, adnate, between pale 

 drab-gray and pale vinaceous-fawn, contracting in drying into 

 small, more or less completely separated masses, not waxy, the 

 margin thinning out; in section 150-180 ^ thick, not colored, 

 composed of erect hyphae 9-10 y. in diameter which start from 

 the substratum at points 30-100 y. apart, branch repeatedly into 

 branches of smaller diameter, are sparingly granule-incrusted, 

 and terminate in large clusters of basidia and one or a few cys- 

 tidia forming a hymenium; no gloeocystidia ; cystidia not in- 

 crusted, septate, 9 ^ in diameter, protruding up to 60 \l beyond 

 the basidia; basidia with 4 sterigmata; spores hyaline, even, 

 9-10 X 6 [x. 



Fructifications up to 4 cm. long, 2 cm. wide. 



On decaying wood of a frondose species. Florida. Autumn. 



While preliminary inspection of P. magnahypha with a lens 

 does not promise more than any one of the great number of little- 

 differentiated, perplexing, whitish resupinate species difficult 

 to identify yet doing an important work in splitting up complex 

 organic compounds, nevertheless its structural characters are 

 unique. The combination of coarse, scattered, trunk-like, erect 

 hyphae with the main trunk hypha or some of its principal 

 branches protruding through and beyond the flat-topped cluster 



