CORNUVIA 275 



peripheral network, and everywhere extended to form short, free, 

 often hamate tips. 

 A single species: 



Heterotrichia gabriell^e Massee 



Mon. 140. 1892. 



1909. Arcyria ferruginea Sauter var. heterotrichia Torr., Fl. Myx. 98. 



1910. Arcyria ferruginea Sauter var. gabriellce (Mass.) Grove, Birm. Nat. Hist. 

 Phil. Soc. 12 : 20. 



Sporangia crowded or gregarious, ovate or oblong, cylindric, stip- 

 itate, at first red, becoming yellowish brown; peridium evanescent 

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

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

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

 branching, slender, 1-1.5 m, 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 spiny-reticulated; spore- 

 mass reddish yellow; spores by transmitted light colorless, globose, 

 7-8 ii. 



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 form bears only the most super- 

 ficial resemblance to A. ferruginea Saut., of which species it is com- 

 monly regarded as a variety. 



The name Arcyria gabriellce Rav., cited by Massee, under which 

 Ravenel sent it to Cooke, was never validly published. 



Very rare. Collected in South Carolina in 1850 and many years 

 later, 1896, by Harvey in Maine. 



4. Cornuvia RosL 

 Versuch 15. 1873. 



Sporangia sessile or plasmodiocarpous; capillitium a network, the 

 threads marked by complete rings; spores reticulate. 



The capillitium is netted as in Arcyria and Hemitrichia, but the 

 prominent ring-like markings are distinctive, although the rare Ar- 

 cyria annulifera is described as bearing on its capillitial threads com- 

 plete rings, apparently of a different character. 



A single species: 



