ARCYRIA 255 



BulHard, /. c, gives the first account of the species by which it 

 can with any certainty be identified. By some authors Clnthrus 

 recutitus Linn, is cited as a synonym. We fail to distinguish A. 

 cookei Mass. from the old type. 



Widely distributed; Maine to Alaska, and south to Mexico and 

 Nicaragua. 



10. Arcyria digitata (Schiv.) Rost. 



1831. Stemonitis digitata Schw., A'^. A. F., p. 260, No. 23 SO. 

 1868. Arcyria bicolor Berk. & C, Jour. Linn. Soc, X., p. 349. 

 1875. Arcyria digitata (Schw.) Rost., Mon., p. 274. 



Sporangia compound, that is gathered in tufts, number 3-12 or 

 more on a single stipe, the clusters themselves scattered ; individual 

 sporangia elongate cylindric, about 3-4 mm. long, ashen gray or nearly 

 white, stipitate; stipe as long or longer than the sporangium, stout, 

 sometimes showing traces of consolidation of several, sometimes none, 

 dark brown or black; capillitium looser and more expanded than 

 in the last, the threads more strongly spinulose; spore-mass concolor- 

 ous, spores under the lens colorless, smooth, globose, 7.5-8 fi. 



Closely related to the preceding, but different in habit and on the 

 whole larger and more robust throughout. The stipes in some cases 

 are completely merged in one ; in others traces of coalescence remain. 

 The number of united sporangia varies. There are some clusters 

 before us containing 16 and 18 in a single fascicle! 



Not very common. On rotten wood of deciduous trees, especially 

 south. 



New England, Pennsylvania, Ohio; Black Hills, South Dakota, 

 and south to Nicaragua. 



Arcyria bicolor Berk, k C. seems to refer to the fact that the spor- 

 angia have sometimes an ochraceous tint. Berkeley's specimens are 

 from Cuba. Our latest specimens are from Nicaragua; the form 

 seems not to be reported from the old world. 



11. Arcyria pomiformis (Leers) Rost. 



1775. Mucor pomiformis Leers, Flor. Herb., p. 218. 

 1875. Arcyria pomiformis Rost., Mon., p. 271. 



Sporangia scattered, gregarious, globose, bright yellow, very minute, 



