RHIZINA. 453 



apex obtuse ; spores ....?; paraphyses slender, septate, 

 the clavate tips brown. 



Peziza Percevali, Berk. & Cooke, Mycographia, fig. 192; 

 Phil., Brit. Disc, p. 45. 



Geopyxis Percevali, Sacc, Syll., viii. n. 234. 



On the ground. 



Appears to be very closely allied, if at all distinct from 

 A. leucomelas. 



RHIZINA. Fries (emended), (figs. 4-7, p. 188.) 



Ascophore sessile, expanded from the first, more or less 

 concave below and furnished with root-like strands of 

 mycelium or fibrillose, fleshy; asci cylindrical, 8-spored; 

 spores continuous, elliptical or fusiform, hyaline, 1 -seriate ; 

 paraphyses present. 



Phizina, Fr., Obs. Myc, i. p. 161 ; Phil., Brit. Disc, 

 p. 40; Sacc, Syll., viii. p. 57. 



Characterised by the expanded, marginate, crust-like 

 ascophore, entirely covered with the hymenium on the 

 upper surface, and attached to the substratum by rhizoids 

 or downy fibrils proceeding from the under surface. 



Allied to the genus Sphaerosoma ; differing in being more 

 broadly expanded, and in the elliptical spores. Judging 

 from a knowledge of British species only, the genus Psilo- 

 pezia, established by Berkeley, would by some be considered 

 distinct, but when the entire series of species included in 

 the genera Phizina and Psilopezia is taken into consideration, 

 it is found impossible to separate the two by any one 

 character. It so happens that we have the two extremes of 

 structure in our British species, JR. inflata having the 

 rhizoids more strongly developed than in any other known 

 species, whereas in P. Babingtonii and P. myrothecioides, 

 these structures are reduced to the form of fibrils. 



Rhizina inflata. Quelet, Enchir., p. 272 ; Sacc, Syll., 

 viii. n. 180. (figs. 4-9, p. 188.) 



Crust-like, convex, irregularly undulated or nodulose, 

 bay-brown or umber, margin paler and often slightly raised, 

 thick and fleshy, form variable, irregularly orbicular or 

 often lobed, under surface paler, more or less concave, 



