KEITHIA. 49 



C. Ascophores scattered, flash-shaped, buried in the matrix and 



furnished with an elongated neck. 



Ostropa. Spores needle- shaped, arranged in a parallel 

 fascicle in the ascus ; neck of ascophore straight, open- 

 ing by a long slit. 



Robergea. Spores needle-shaped, arranged in a parallel 

 fascicle in the ascus ; ascophore horizontal, neck becom- 

 ing vertical. 



Laqueria. Spores elliptical, 2-seriate. 



D. Ascophores scattered, spherical then expanding and exposing 



a circular, dingy disc ; spores long and slender, arranged in 

 a parallel fascicle. 



Schizoxylon. 



E. Ascophores gregarious on a black, effused stroma. 



Rhytisma. Spores needle-shaped, arranged in a parallel 

 fascicle in the ascus. 



Cryptomyces. Spores broadly elliptical. 

 Growing on woody plants (Salix). 



Ephelina. Spores narrowly elliptical. 



Growing on herbaceous plants (JRhinanthus). 



KEITHIA. Sacc. (figs. 1-4, p. 12.) 



Ascophore ernmpent, innate, splitting above into a few 

 irregular teeth and exposing the . disc; asci tetrasporous ; 

 spores brown, divided by a transverse septum into two cells 

 of very unequal size ; paraphyses present. 



Keithia, Sacc, Syll. Suppl., vol. x. p. 49. 



Phacidium, Phillips, Gard. Chron., 1880. 



Separated from Phacidium by Saccardo, on account of the 

 4-spored asci, and the brown, 2-celled spores. 



Keithia tetraspora. Sacc, Syll. Suppl., x. p. 49. 

 (figs. 1-4, p. 120 



Ascophore epiphyllous, innate, erumpent, circular or 

 oblong, up to 1 mm. long, convex, greyish, surrounded by a 



VOL. IV. e 



