1910] 



BURT THELEPHORACEAE OF NORTH AMERICA. VII 



327 



menial crust not loosely interwoven on its under sides, pro- 

 basidia terminal on the hyphae, and the large hook-shaped, 

 presumably spore-bearing, organs of the upper surface. If 

 these organs grow out from the probasidia, the probasidium 

 must differentiate into the organ, for I have traced the 

 curved organ back to the colored hyphal cells. 



Specimens examined: 

 Mexico: locality not stated, C. G. Pringle, comm. by W. G. 



Farlow, 5 (in Mo. Bot. Gard. Herb., 44590). 



4. S. pseudopedicellatum Burt, n. sp. 



Thelephora pedicellata of most American authors but not 

 of Schweinitz. 



Type: in Mo. Bot. Gard. Herb. 



Fructification resupinate, effused, coriaceous, dry, not sep- 

 arable from the substratum, varying from avellaneous and 



Fig. 3 

 S. pseudopedicellatum. 

 h, portion of hymenium showing the longitudinally inter- 

 woven hyphal ends or paraphyses and some probasidia; J), 

 three spore-bearing organs; s, spores. X 640. 



wood-brown to cinnamon-brown, the margin undulate, whit- 

 ish; in structure three-layered, with (1) a layer next to the 

 substratum of densely interwoven, thick-walled, slightly col- 

 ored hyphae Sfi in diameter, which form (2) a layer of 

 erect, hyphal pillars, or pedicels, each about 500/^ long, 20- 

 40/A in diameter, about 3-5 to a millimeter, whose hyphae 

 spread apart at the upper end of the pillars, branch, and 

 form and support (3) the hymenial crust about SOO/t* thick, 

 with hyphae loosely interwoven near the pillars, 3-3%^ in 



