191S] 



BURT THELEPHORACEAE OF NORTH AMERICA, IX 203 



14. A. Weirii Burt, n. sp. 

 Type : in Burt Herb. 



Fructification resupinate, broadly effused, adnate, glabrous, 

 becoming cracked into small polygonal masses, drying car- 

 tridge-buff, the margin thinning out; in structure 200-900 ^ 



thick, composed of thin-walled, irregu- 

 lar, hyaline hyphae 2 /x in diameter, 

 which bear laterally here and there 

 short, erect branches with ovoid body 

 15x4-4| /x, from which radiate 6-12 

 prongs, each 4rA^ n long, and constitute 

 the paraphyses at surface of the 

 ^^^ ?*.. hymenium; basidia with sterigmata not 



Cockroach-shaped para- f ouud ; sporcs hyaline, minutely echinu- 

 physes, c; somewhat simi- jate, subglobose, 6x5-6 jLt in one speci- 



lar hyphal branches Irom 7 <-> . 



interior of section, hr; im- men, 10-12 XS-IO^ ju in another. 



ma^ure^basidium, 6; spore, FrUCtificatioU 1-3 Cm. loUg, 1-2 Cm. 



broad on bark; 8-10 cm. long, 2-3 cm. 

 broad on decorticated wood — broken off at one end and along- 

 one side in the latter specimens. 



On rotting wood of Abies grandis and Thuja plicata and on 

 bark of Larix occidentalis. Idaho and British Columbia. 

 August and September. 



A. Weirii has the aspect of a widely effused Corticium, but 

 it is distinguished from any Corticium of similar aspect by 

 the minutely echinulate spores; the cockroach-shaped para- 

 physes distinguish this species from other species of Aleuro- 

 discus. 



Specimens examined: 

 Idaho : Priest River, J. R. Weir, 70, type, and 389 (the latter 



in Mo. Bot. Gard. Herb., 12249). 

 British Columbia: Kootenai Mts., near Salmo, J. R. Weir, 

 459, 490 (in Mo. Bot. Gard. Herb., 8768 and 21980 re- 

 spectively). 



(To be continued.) 



