CORNUYIA.] TRICHIACE.E. 181 



long, black, scarcely or not at all shining, smooth ; wall 

 black, opaque, subcellular, subcoriaceous, splitting longitudinally 

 and dehiscing in a valvate manner. Oapillitium yellow or citron- 

 yellow, protruded elastic-ally ; threads terete, 4 to 5 ju, diam., 

 combined into a loose net, everywhere covered with erect spines 

 5 to 6 x 1 ft, spirals obsolete. Spores elliptic -globose, papilloso- 

 scabrid, 10 to 12 //,, yellow. 



Hob. On bark. Brazil. 



This description applies well to Perichcena chrysosperma List. 



11. H. pusilla Speg., I.e., xii.,p. 257 (1881). Sporangia rather 

 closely gregarious, subcylindrico-elliptical, 0'4 to 0'5 mm. high, 

 0*15 to O25 mm. diam., obtuse above, truncate below, stem almost 

 or entirely wanting ; at first amber-red, then rose-colour. Capilli- 

 tium forming a rather dense network of terete rose-coloured 

 threads, 3 to 4 //, thick; spirals three or four, furnished with 

 minute spinules. Spores rose or flesh-coloured, globose, smooth, 

 7 to 9 /A diam. 



Hab. On bark. Argentine Republic. 



SPECIES EXCLUDED FROM THE GENUS. 



Hemiarcyria stipata Host. = Arcyria stipata List. 



Hemiarcyria applanata Cooke & Mass. = Perichcena depressa Lib. 



Genus 36. CORNUVIA Rostafinski, Versuch, p. 15 (1873). 

 Sporangia sessile; capillitium a network of threads with thicken- 

 ings in the form of simple rings ; spores reticulated. 



1. C. Serpula Rost., Versuch, p. 15 (1873). Plasmodium 1 

 Sporangia forming curved or branched plasmodiocarps, about 

 0*3 mm. broad, or subglobose, sessile, golden-yellow ; sporangium- 

 wall membranous, pale yellow. Capillitium a network of freely 

 branching yellow threads, 3 to 5 /JL diam., marked with well- 

 defined, prominent ring-shaped thickenings, arranged at intervals 

 of about 2 fjL or irregularly scattered ; junctions of the branches 

 without thickenings. Spores yellow, reticulated with narrow 

 bands forming a net with from ei^ht to twelve meshes to the 

 hemisphere, 10 to 12 ^ diam. ; border O5 to I /JL broad. Rost., 

 in Fuckel, Symb. Myc., Nachtr. 2, p. 76 (1893); Rost,, Mon., 

 p. 239 ; Cooke, Myx. Brit., fig. 189. Arcyria Serpula Wigand. in 

 Pringsh., Jahrb., iii., p. 44 (1863). Ophiotheca Serpula Mass., 

 Mon., p. 135. 



Plate LXVL, A.d. plasmodiocarp, x 20 ; e. capillitium, x 600 ; /. 

 spore, x 600 (Germany). 



Hab. On tan. Germany (B. M. 784 and Strassb. Herb.). 



SPECIES NOT MET WITH IN THE QUOTED COLLECTIONS. 



2. C. dictyocarpa Krupa, in Cosmos, p. 377 (1886). Related 

 to C. circumscissa Rost. (Perichcenia chrysosperma Lister), but 



