210 ASCOMYCETES. 



3. Brown, multiseptate conidia : 



{a) In brown, very large, smooth-coated pycnidia (Fig. !)!), h). 

 (b) In darker and smaller ]\vcnidia with pointed aperture. 



4. Brown, l)ieellular conidia, in little dark pycnidia (Diphdia a/U'si). 



B. Perithecia. 

 o. Brown, mnltiseptate ascosjjores, in perithecia generally of dark colonr, 

 and with depressed pore (Fig. 100). 



Cucurbitaria sorbi K;ir.steii. This fungus appears to pro- 

 duce disease in a manner similar to C. laburni. It was described 

 by me in ISSG^ from specimens collected in the Bavarian 

 forest-land from young Pynis Ancuparia. They were easily 

 distinguished in August by their withered twigs, both l)ark and 

 wood being killed in tracts by the mycelium. In another 

 locality I found well-developed perithecia, also on P. Aimqmria. 



Cucurbitaria pityophila Fries, occurs on the living branches 

 of vaiious conifers, cr/. Finns Cemhr/i. 



SPHAERELLOIDEAE. 



Stigmatea. 



The naked perithecia are superficially seated on the sub- 

 stratum. The ascospores, eight in each ascus, are clear and two- 

 celled. The species are parasites. 



Stigmatea robertiani Fr. (Britain and U.S. America). Occurs 

 on living leaves of Gcniniam Rohertianum. 



St. ranunculi Fries. On living leaves of Piannacuhis rcpens 

 (Britain and U.S. America). 



St. mespili Sor. (U.S. America). This species appears in 

 spring as reddish-brown spots on the leaves of wild pear-trees. 

 At these places the epidermis becomes ruptured, and cushions 

 are formed from which brown conidia are given off from short 

 conidiophores. This stage was formerly known as Morthicra 

 mespili. The conidia are at first obovoid, but later seem to 

 consist of four separate cells arranged in a cross, and each 

 furnished with a transparent bristle. Each conidium produces 

 a germ-tube which penetrates the epidermis, and in a month 



^ 1 have since found from Saecardo that this fungus was described by Karsten 

 {Mycol. Fenn. , ii. " ad rainos dejectos Sorbi anru[)nricui in Fennia merid. et media ") ; 

 it was, however, unknown for (rermany to that author. (Auth.) 



