PERISPORIACEI. 



648 



Order XXVII. PERISPORIACEI. 



Peritliecia siibglobose, always closed, except by decay, mostly 

 membranaceous ; nucleus never diffluent. — Berk. OutLp.4:03. 



Perithecia free, astomous, often surrounded by threads, distinct from the 

 mycelium (fulcra). Asci tubular or saccate, often absorbed at an early 

 stage, springing from the base, occasionally solitary. Many of the species 

 grow on living leaves, and are very destructive. — Berk Irdr. p. 273. 



Perithecia collapsing above, attached to radiating fibres Lasiobotrys. 

 Perithecia subglobose, without distinct thallus or ap- 

 pendages .......... Perisporium. 



Conceptacle with one sporangium. 



Appendages floecose Sphcerotheca. 



Appendages dichotomous. thickened at the tips . Fodosjjhcera. 

 Conceptacle with many sporangia. 



Appendages needle-shaped, rigid .... Phyllactinia, 



Appendages hooked Urocinula. 



Appendages dichotomous ...... ^dicrosphceria. 



Appendages floecose ....... Erysiphe. 



Perithecia thin, brittle, sporangia linear, sporidia col- 

 oured .......... Chcetomium. 



Perithecia seated on conidiiferous threads . . . Ascotricha. 



Perithecia reticulated, attached to mucedinous threads . Ev/rotium. 



Gen. 275. 



ferisforzum:, Fr. 



Perithecium subglobose, without 

 any manifest thallus or appendages; 

 asci clavate ; sporidia indefinite. — 

 Berk. Outl. p. 403. {Fig. 310.) 



1906. Ferisporiuxn princeps. 



BerTi. •'- Princely Perisporium." 



Peridia in clusters, sub-hemis- 



XT 01 n pherical, very black and larg-e : 



J^ig. 310. -T 1 -u J i 



spondia brown, very much crowded 



in the asci. — Berk, in litt. Berk. Out!. x>. 403. Berk. exs. no. 287. 



On a beam which had been taken out of a chimney and ex- 

 posed to the weather. King's Cliffe. 



2e 2 



