HETEROTRICHIA 257 



3. Heterotrichia Mass. 



1892. Heterotrichia Mass., Mon., p. 139. 



Sporangia distinct, stipitate; the peridium simple evanescent above 

 as in Arcyria; capillitium centrally attached, freely branched, the 

 threads within very slender, without broad, anastomosing to form a 

 dense peripheral network, and everywhere extended to form short, 

 free, often hamate tips. A single species, — 



1. Heterotrichia gabriellae (Rav.) Mass. 



Plate XIIL, Figs. 1, 1 a. 



1850. Arcyria gabriellae Rav. in litt. ad Cooke. 



1892. Heterotrichia gabriellae Mass., Mon., p. 140. 



1911. Arcyria ferruginea Saut., var. heterotrichia List., Mycet., 2nd ed., 

 p. 234. 



Sporangia crowded or gregarious, oblong cylindric, ovoid, at first 

 red, becoming yellowish brown, stipitate; the peridium evanscent 

 except the calyculus, which is small and thin, polished; stipe shorter 

 than the expanded capillitium, pale reddish brown ; capillitium cen- 

 trally attached, showing threads of two sorts, those within freely 

 branching, slender, 1-1^ /x, marked with half-rings or ridges, those 

 on the periphery very different, yellow, broad, 5-6 ^, forming rather 

 dense reticulations, with abundant free tips, acute and often curved, 

 the whole surface here minutely and densely warted ; spore-mass red- 

 dish yellow, spores by transmitted light colorless, globose, 7-8 fi. 



The peculiar double capillitium seems to separate this form from 

 the true arcyrias. Some difference in the diameter of the capillitial 

 threads in different regions is not infrequent in the several species 

 of Arcyria, but that difference is here emphasized and rendered yet 

 more striking by the peculiar free tips. The present forms bear 

 only the most superficial resemblance to A. ferruginea Saut., with 

 which species it is in some quarters sought to unite it. 



Very rare. Collected, as noted, nearly fifty years ago in South 

 Carolina by Ravenel, it was more recently (1896) again collected in 

 Maine by the late Professor Harvey. 



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