COENUVIA.J TRTCHIACE^. 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 elastically ; threads terete, 4 to 5 /a diam., 

 combined into a loose net, everywhere covered with erect spines 

 5 to 6 X 1 /A, spirals obsolete. Spores elliptic-globose, papiUoso- 

 scabrid, 10 to 12 ^u,, yellow. 



Hah. 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 0'25 mm. diam., obtuse above, truncate below, stem almost 

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

 tium forming a rather dense network of terete rose-coloured 

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

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

 7 to 9 ju, diam. 



Hah. On bark. — Argentine Republic. 



SPECIES EXCLUDED PEOM THE GENUS. 



Hemiarcyria-sti^ata Rost. = Arcyria stipata List. 



Hemiarcyria appJanata Cooke & Mass. = FericJicena depressa Lib. 



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

 Sporangia sessile ; oapillitium a network of threads with thicken- 

 ings in the form of simple rings ; spores reticulated. 



1. C. Serpula Eost., Yersuch, p. 15 (1873). Plasmodium? 

 Sporangia forming curved or branched plasmodiocarps, about 

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

 waU membranous, pale yellow. CapilUtium a network of freely 

 branching yellow threads, 3 to 5 /a diam., marked with weU- 

 defined, prominent ring-shaped thickenings, arranged at intervals 

 of about 2 /x or irregularly scattered ; junctions of the branches 

 without thickenings. Spores yellow, reticulated with narrow 

 bands forming a net with from eight to twelve meshes to the 

 hemisphere, 10 to 12 /j. diam. ; border 0'5 to 1 /«, broad. — Eost., 

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

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

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

 Mon., p. 135. 



Plate LXVI., A. — d. plasmodiocarp, x 20 ; e. oapillitium, x 600 ; /. 

 spore, X 600 (Grermany). 



Hah. On tan.— -Germany (B. M. 784 and Strassb. Herb.). 



SPECIES NOT MET WITH IN THE QUOTED COLLECTIONS. 



2. C. dictyoearpa Krupa, in Cosmos, p. 377 (1886). Eelated 

 to C. circumscissa Eost. {Perichcenia chrysosperma Lister), but 



