352 



The North American Cup-Fungi 



8-spored; spores usually comparatively large, occasionally 

 minute, simple, or becoming tardily several-septate, the septa- 

 tion often erratic even in the same species; paraphyses colored 

 and their tips agglutinated into a dark-brown or blackish epi- 

 thecium. 



T\-pe species, Peziza Cerasi Pers. 



This genus grades rather closely into Cenangiiim but usually 

 has smaller discoid apothecia and large often septate spores. 

 The macroconidia in the various species which are produced in 

 irregular pycnidial cavities in a fleshy stroma are fusiform, usu- 

 ally curved and septate. The conidial stage so far as observed 

 belongs to the form genus Micropera (Gelatinosporium) . 



These studies are based parth' on the work of Dr. J. W. 

 Groves (Mycologia 38: 351-431. 1946). 



Apothecia 1.5 mm. or more in diameter. 

 Not on coniferous hosts. 



On Primus, apothecia distinct. 

 On Betula, apothecia often coalesced. 

 On coniferous hosts, Abies and Tsuga. 

 Apothecia mostly less than 1.5 mm. in diameter. 

 Ascospores less than 5 ju in diameter. 



Conidia in beaked pycnidia, on Viburnum. 

 Conidia not in beaked pycnidia. 



Asci more than 10 ju broad; on Nemopanthes. 

 Asci less than 10 m broad. 



On Amelanchier, apothecia black. 

 On Sorbus, apothecia brownish. 

 Ascospores more than 5 yu in diameter. 

 Conidia in beaked pycnidia. 



Conidia elongate-ellipsoid; on Acer. 

 Conidia elongate-fusiform; on Fritnus. 

 Pycnidia usually single. 

 Pycnidia usually cespitose. 

 Conidia not in beaked pycnidia. 

 On coniferous hosts. 



Ascospores less than 14 /u long; on Picea. 

 Ascospores usually more than 14 ^ long. 

 On Pinus. 

 On Libocedrus. 

 Not on coniferous hosts. 



Asci usually less than 15 /x in diameter. 



On Hamamelis. 

 Asci usually more than 15 yu in diameter. 

 On Fraxinus. 

 On Chionanthus. 

 On Morus. 



1. D. Cerasi. 



2. D. mnlliuscula. 



3. D. balsam ea. 



4. D. Viburni. 



5. D. Peckiana. 



6. D. bicalnr. 



7. D. Ariae. 



8. D. accrina. 



9. D. Padi. 



10. D. Prunastri. 



11. D. piceina. 



12. D. pinicola. 



13. D. Libocedri. 



14. D. Hamamelidis. 



15. D. Tiilasnei. 



16. D. Chionanthi. 



17. D. Mori. 



