196 THE NORTH AMERICAN SLIME-MOULDS 



Micheli, and by several other authors of the eighteenth century, 

 who take the trouble to describe and figure the species, but 

 still give the Linnean binomial as a synonym ; we may give 

 Linne here the credit. As a matter of fact, Batsch under 

 Embolus crocatus first presents an unmistakable description and 

 figure. 



Maine to the Black Hills and Colorado, and north and west ; 

 Alaska to Nicaragua. 



9. ARCYRIA CINEREA (Bull.) Pers. 



PLATE II., Figs. 3, 3 a. 



1791. Trichia cinerea Bull., Champ, de France, p. 120, Tab. 477, Fig. iii. 

 1801. Arcyria cinerea (Bull.) Pers., Syn. Fung., p. 184. 



Sporangia scattered or gregarious, ovoid or cylindrical, gen- 

 erally tapering upward, about 2-3 mm. high, ashen gray, 

 sometimes with a yellowish tinge, stipitate; calyculus very 

 small, thin ; stipe about half the total height, rising from a 

 small hypothallus, thin, gray or blackish, densely crowded with 

 spore-like cells ; capillitium dense, freely branching, ashen, or 

 yellowish, little expanded in dehiscence, the threads almost 

 even, though a little wider below, minutely spinulose ; spore- 

 mass concolorous, spores by transmitted light colorless, smooth, 

 6-7 p. 



A very common little species, easily recognized by its color 

 and habit. The capillitium is more dense than in any other 

 species and expands less. The stipe is about equal to the 

 expanded capillitium, unusually long. The plasraodium occurs 

 in rotten wood, especially species of Tilia, is gray and, judging 

 from the number of sporangia found in one place, scanty. 



Bulliard, I.e., gives the first account of the species by which 

 it can with any certainty be identified. By some authors 

 Clathrus recutitus Linn, is cited as a synonym. We fail to dis- 

 tinguish A. cookci Mass, from the old type. 



Widely distributed ; Maine to Alaska, and south to Mexico 

 and Nicaragua. 



