150 THE FUNGI WHICH CAUSE PLANT DISEASE 



thin subcuticular stroma. On this the spores are produced on 

 short erect conidiophores, Fig. 106; eventually the cuticle ruptures 

 and the spores are shed. The spores germinate by a tube which 

 arises from near the base of a bristle. 



F. mespili (Sor.) Atk. on medlar with the conidial form Entomo- 

 sporium mespili (D. C.) Sacc. is perhaps identical with the above. 

 There are only minor and uncertain differences in the conidial 

 stage.** Sorauer by inoculation with conidiospores produced on 

 pear typical spots which bore mature pustules after an interval of 

 about a month. He referred the fungus to the genus, Stigmatea 

 Fries. See p. 243. 



Cenangiacese (p. 134) 



Ascoma at first buried, later erumpent, on a stroma, dark, with a 

 roimded or elongate disk; asci 8-spored; spores long or filiform, 1 to 

 many-celled, often muriform, hyaline or dark; paraphyses branched 

 forming a complete epithecium. About two hundred fifty species. 



Key to Subfamilies and Genera of Cenangiacese 



Ascocarps coriaceous, corneous or waxy 



when fresh I. Dermatese. 



Ascocarps without a stroma, at first im- 

 mersed. 

 Spores 1-celled 

 Ascocarps externally bright colored, 



downy, 1. Velutaria. 



Ascocarps iwrtemally dark 

 Ascocarps smooth; spores hyaline. 2. Cenangium, p. 151. 

 Ascocarps downy; spores colored. . 3. Schweinitzia. 

 Spores 2 to 4-celled, elongate 

 Spores hyaline 

 Spores always 2-celled; ascocarp 



smooth 4. Cenangella. 



Spores 2 to 4-celled; ascocarps 



downy externally 5. Crumenula. 



Spores at length brown or black 

 Disk elongate with a thick rim. . . 6. Tryblidiella. 

 Disk rounded 



Rim thin; spores 2-celled 7. Pseudotryblidiiim. 



Rim involute; spores 4-celled. . 8. Rhytidopeziza. 



