[Vol. 5 



202 



ANNALS OF THE MISSOURI BOTANICAL GARDEN 



line, minutely echinulate, subglobose, 15-18 /x, or rarely 20 /i, 

 in diameter. 



Fructifications at first about 2-3 mm. in diameter, then 

 laterally confluent into patches up to 10 cm. long and 2 cm. 

 broad. 



On stem and twigs of dead standing seedling of Pseudotsuga 



taxifolia and on limbs 

 of Tsuga heterophylla 

 on the ground. Idaho, 

 Washington, and Ore- 

 gon. September and 

 October. Rare. 



This species is so thin 

 and widely effused that 

 it is likely to be re- 

 garded as a Corticium 

 until examined with a 

 microscope. If sought 

 for especially it could 

 probably be recognized 

 when collected by its 

 buff color and occur- 

 rence upon western 

 Tsuga and Pseudotsuga, The minutely echinulate, globose 

 spores, brush-shaped paraphyses occurring between ordi- 

 nary flexuous paraphyses, and the thin fructification wholly 

 destitute of crystalline and granular matter are a good 

 combination of characters separating A, penicillatus from 

 other resupinate species. 



Specimens examined : 

 Idaho: Priest River, J. R. Weir, 109, 129 (in Mo. Bot. Gard. 



Herb., 10811 and 12721). 

 Washington : Hoquiam, C, J. Humphrey, 6384; Sequim, J. M. 

 Grant, comm. by Mrs. F. W. Patterson (in Mo. Bot. Gard. 

 Herb., 8936). 

 Oregon : Eugene, C. J. Humphrey, 6084, type. 



Fig. 13 

 A. penicillatus. 

 Brush paraphyses, hr; other paraphyses, p; 

 basidium 6. X870. 



