CORNUVIA.] 
TRICIlIACEi55. 
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, everjrwhere covered with erect spines 
5 to 6 X 1 /i, spirals obsolete. Spores elliptic-globose, papilloso- 
scabrid, 10 to 12 ya, yellow. 
Hah. Ou bark. — Brazil. 
This description appHes well to Perichcena chrysosperma List. 
11. H. pusilla Speg., Ic, xii., p. 257 (1881). Sporangia rather 
closely gregarious, subcyhndrico-eUiptical, 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. Capilli- 
tium forming a rather dense network of terete rose-coloured 
threads, 3 to 4 /a thick; spirals three or four, furnished with 
minute spinules. Spores rose or flesh-coloured, globose, smooth, 
7 to 9 yu, diam. 
Hob. On bark. — Argentine Republic. 
SPECIES EXCLUDED FROM THE GENUS. 
Hemiarcyria stipata Kost. = Arcyria stipata List. 
Heiniarcyria applanata Cooke k Mass. = Perichcena depressa Lib. 
Genus 36.— CORNUVIA Eostafinski, Versuch, p. 15 (1873). 
Sporangia sessile; capillitium a network of thi'eads 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- 
wall membranous, pale yellow. Capillitium a network of freely 
branching yellow threads, 3 to 5 /a diam., marked with well- 
defined, prominent ring-shaped thickenings, arranged at intervals 
of about '2 jx ov 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 /a diam. ; border 0'5 to 1 /a 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., iii., p. 44 (1863). Ophiotheca Serpula Mass., 
Mon., p. 135. 
Plate LXVI., k.—d. plasmodiocarp, x 20 ; e. capillitium, x 600 ; /. 
spore, X 600 (Germany), 
Hah. 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). Eelated 
to C. circumscissa Eost. {Perichcenia chrysosperma Lister), but 
