Sumstine: North American Hyphomycetes 53 



a thin, white, soft layer like a Corticium on the surface of the 

 wood. 



"On dead wood and bark. Topeka, Kansas." 

 The type is not accessible and the description not clear enough 

 for exact determination. 



Excluded Species 



1. Rhinotrichum fusiferum Berk. & Curt. Grevillea 3 : 108. 

 1875. The original description is exceedingly short and might 

 apply to a number of fungi. 



" Dull yellow, flocci short, inarticulate, studded above with the 

 fusiform spores, .ooi6 , -ooi5 / long. 



" A very pretty species. Car. Inf. 4964." 



The part of the type specimen sent from Berkeley's herbarium 

 was too meager for identification. A number of fusiform spores 

 5-36 p were found in the material. The spores seemed granular 

 or even warted and some seemed to be septate. Too little is known 

 about this species to assign it definitely to any genus. 



2. Rhinotrichum breve Berk. & Curt. Grevillea 3 : 109. 1875. 

 The label also bears the name Aspergillus affinis. The spores in 

 the type specimen agree very well with the description but the 

 attachment of the spores could not be satisfactorily determined. 

 It evidently does not belong to the genus Rhinotrichum. The 

 specimen was collected in South Carolina. 



3. Rhinotrichum doliolum Pound and Clements, Bot. Sur. Neb. 

 4:5. 1896. 



" Effused, white, compact, velvety, gray, or drab ; sporophore 

 ascending much branched ; filaments hyaline, tortuous, many sep- 

 tate, 5 p wide, thickly beset with bottle-shaped basidia, 7-8 X 3-4^, 

 generally opposite, rarely alternate; conidia 2-several on each 

 basidium, borne on short sterigmata, hyaline, ovoid-ellipsoid 

 3-5 X 2-3 /*. 



" Forming a thick crust on the sporangia and stipes of a slime 

 mould, bluffs of the Missouri river, Bellevue (4381)." 



This species evidently does not belong to Rhinotrichum as 

 defined in this paper. The basidia ( ?) with 2-several spores point 

 to the genus Olpitrichum. The type specimen has been lost or 

 destroyed. 



