Arcyria. 1G7 



Spores smooth. 

 Arcyrio leiocarpa, Mass. 



Sporangia scattered or aggregated, obovate or pyriform, rarely 

 almost globose, pallid, stem same colour, as long as diameter 

 of sporangium; mass of capillitium and spores concolorous, or 

 with a slight ochraceous tint ; capillitium sparse, forming a loose 

 net, threads 5 //. thick, spirals thin, rather close, slightly pro- 

 minent on the convex side of the bent threads, usually furnished 

 with scattered, rudimentary spinules, free tips very rare or 

 absent ; spores globose, smooth, 12 14 p. diameter. 



Hemiarcyria leiocarpa, Cooke, Myx., U. States, in Ann. Syc. 

 Nat. Hist., New York, xi., n. 12, p. 405; Cooke, Myx. Brit., 

 figs. 252, 255; Sacc., Syll., vii., 1, n. 1519; Mass., Rev. Trich., 

 p. 353, fig. 33. 



In Saccardo's Sylloge VII., pt. I., p. 440, n. 1519, Rostafinski 

 is given as the author of the present species, and the reader is 

 referred to "Rost., Mon., p. 267" for the description, but in 

 reality the present species is not included in Rostafinski's work. 



Arcyria leocarpoides, Mass. 



Sporangia globose or pyriform, 0'6 0*8 mm. diameter, flesh- 

 red or fulvous, often depressed and deeper coloured at the apex, 

 not at all or only a little shining, very smooth, cortex rather 

 thick, subcartilaginous, soon breaking away in pieces above, 

 usually persistent, cup-like at the base ; stem rather rigid, erect, 

 brownish or blackish, slender, even or subrugulose, about as 

 long as diameter of sporangium; capillitium after dehiscence 

 protruding elastically, attached at the base, very persistent, 

 brownish-fulvous, or olive-fulvous, threads slender, cylindrical, 

 5 6 /u. thick, forming a dense net with numerous terete, abruptly 

 rounded free arms, threads with 3 4 spirals, very smooth, not 

 papillate; spores globose, 8 10 ju. diameter, very smooth, proto- 

 plasm granular, fulvous-olive. 



Cornuvia leocarpoides, Speg., Fitng. Arg. Pug. I., n. 264 ; Sacc., 

 Syll., vii., 1, n. 1546. 



On rotten wood. Brazil. 



