Sumstine : North American Hyphomycetes 47 



The genus Sporotrichum is also closely allied to Rhinotrichum, 

 the chief difference being the procumbent fertile branches of the 

 former. It is possible that a study of the described species of 

 Sporotrichum will add a number of species to Rhinotrichum. 



Key to the Species 



Spores globose or nearly so. 

 Spores smooth. 



Stratum reddish-brown. 



1. 



R. rubiginosum. 



Stratum yellow-rust color. 



2. 



R. subferruginosum, 



Stratum yellow to brown. 







Spores large, 15-16 fi. 



3- 



R. fulvum. 



Spores smaller. 







Stratum yellow. 



4- 



R. Curtisii. 



Stratum yellow-brown. 



5. 



R. laevisporum. 



Spores not smooth. 







Spores granular. 



6. 



R. armeniacum. 



Spores roughened, 5 /jl. 



7- 



R. carneum. 



Spores roughened, 8-10 fi. 



8. 



R. subalutaceum. 



Spores not globose. 







Stratum white to cinereous. 



9. 



R. repens. 



Stratum sulphur-colored. 



10. 



R. sulfureum. 



Stratum light-brown. 



1 1. 



R. bicolor. 



Stratum light-yellow. 



12. 



R. tenerum. 



Stratum tan-yellow. 



13. 



R. ramosissimum. 



i. Rhinotrichum rubiginosum (Fr.) 

 Sporotrichum rubiginosum Fries, Syst. Myc. 3: 417. 1829. 

 Physospora rubiginosa Fries, Summa Veg. Scand. 495. 1849. 



Stratum very thin, cespitose, reddish-brown, rubiginose ; hyphae 

 septate, branching, 6-8 fx thick; fertile branches erect, simple or 

 branched, ultimate divisions usually swollen, sometimes atten- 

 uate, bearing the smooth, concolorous, globose-obovoid, 11-15/x 

 spores. 



On bark and wood. 



Specimens examined: Canada, Ellis Collection 1623; New 

 York, Peck. 



2. Rhinotrichum subferruginosum sp. nov. 



Stratum thin, floccose, bright yellow-rust color, ferruginous ; 

 hyphae branched, septate, 8-10^ thick; fertile branches erect or 

 suberect, branched, attenuated upwards or ultimate divisions 

 swollen ; spores borne on several divisions of the fertile branches, 

 smooth, globose, colored, 14 /x. 



On bark, woodpile, Hope, Jamaica, October 25, 1902. 

 Specimens examined: Jamaica, Earle 93 (type). 



