298 The North American Cup-Fungi 



On branches of Populus, more rarely on Fraxi- 

 nus. 

 Apothecia scattered, densely' white- 



pruinose. 

 Apothecia cespitose, not pruinose. 

 Apothecia small, less than 5 mm. in diameter. 

 Spores medium large, 7-10 ju long. 

 On branches of Ceanothtis. 

 On leaves of Yucca. 

 Spores small 4-6 n long. 



Apothecia accompanied by flask-shaped 



conidial bodies. 

 Apothecia not as above, forming tubercular 

 masses. 



1. Cenangium Abietis (Pers.) Rehm in Rab. Krypt.-Fl. 1'': 227. 



1889. 



Peziza Abietis Pers. Syn. Fung. 671. 1801. 



Cenangium ferruginosum Fries, Vet. Akad. Hand). 1818. 361. 1818. 



Dermatea Pini Phill. & Hark. Grevillea 13: 22. 1884. 



Apothecia gregarious, usually occurring in cespitose clusters, 

 subsessile, at first nearly globose, later opening irregularly, 

 expanding and becoming subturbinate, often irregular from 

 mutual pressure, the margin inflexed when dry, coated externally 

 with a reddish-brown powder, 1-1.5 mm. broad; hymenium 

 concave, yellowish to olive-brown; asci cylindric-clavate, reach- 

 ing a length 100-120 m and a diameter 12-18 m, 8-spored; spores 

 ellipsoid, 5-7 X 10-14 /x, 1-seriate, or partially 2-seriate; pa- 

 raphyses stout, simple, about 2 /z in diameter, slightly enlarged 

 above, pale-yellowish. 



On branches of various species of Pinus, Abies, Picea and 

 probably other conifers. 



Type locality: Europe. 



Distribution: New England to Oregon, California and 

 Alabama; also in Europe. 



Illustrations: E. & P. Nat. Pfl. 1^: 233, /. £-G; Grev. 

 Scot. Crypt. Fl. 4: pi. 197; Cooke, Handb. Brit. Fungi 2:/. 337. 



Exsiccati: Ellis & Ev. N. Am. Fungi 2050, 2050 (B), Fungi 

 Columb. 1416, 1514; Clements, Crypt. Form. Colo. 517. 



2. Cenangium atropurpureum Cash & Davidson, Mycologia 32: 



734. 1940. 



Apothecia erumpent, occurring singly, or two or three to- 

 gether from a stroma beneath the bark, subglobose, then cupulate, 



