152 



THE FUNGI WHICH CAUSE PLANT DISEASE 



Fig. 107. — Cenangium, habit sketch, asci and 

 paraphyses. After Tulasne. 



Conidia ( = Brunchorstia 

 destuens Erikss.) in pyc- 

 nidia which are partially 

 embedded in the host, 

 the smaller simple, the 

 larger compound, 1-2 mm. 

 in diam.; spores 30-40 x 

 3 n, tapering-rounded at 

 each end, 2 to 5-septate. 



A second conidial phase 

 (=Dothichiza ferruginosa 



Sacc.) has simple spores. 



C. vitesia occurs in conidial form as Fuckelia on Ribes. 



In many 



Dermatea Fries (p. 151) 



A genus of over sixty species some of them parasitic 

 species conidia in pycnidia are known. 



Ascocarps scattered or clustered, stromate, sessile or not, 

 black or brown; asci small, thick- 

 walled, 8 or 4-spored; spores el- 

 lipsoid or spindleform, 1-celled, 

 becoming 4 to 6-celled, brown, 

 2-ranked; paraphyses septate, api- 

 cally enlarged and colored. 



D. carpinea (Pers.) Rehm. is 

 a wound parasite on the horn- 

 beam and beech; D. cinnamomea 

 (Pers.) Rehm. on oaks; D. acerina 

 Karst, on maple (Acer pseudo- 

 platanus) ; all in Europe. 



D. pninastri (Pers.) Fr., with 

 its conidial form Sphaeronema spurium Fr. is found on Bark of 

 various species of Prunus, in Europe and America. 



Bulgaria Fries (p. 151) 



The gelatinous apothecium is rather large and dark colored; 

 asci 4 to 8-spored; spores 1-celled, elongate, brown. 

 There is one species worthy of mention. 



Fig. 108.— Dermatea. A, habit 

 sketch; C, ascus and paraphyses. 

 After Tulasne and Rehm. 



