132 THE NORTH AMERICAN SLIME-MOULDS 



the soft purple brown tints, are remarkable, and enable one to 

 recognize the form at sight. 



New York, Pennsylvania, Ohio, Illinois. 



9. COMATRICHA PERSOONII Rost. 



1875. Comatricha persoonii Rost., Man., p. 201. 



1890. Comatricha subcaspitosa Peck., Rep. N. Y. Mus., p. 25. 



1888. Comatricha gracilis Wingate, Ell. and Everh., N. A. F., 2094. 



1892. Comatricha pulchella Bab., Macbr., Bull. Lat. Nat. Hist. la., II., 



P- 139- 



Sporangia gregarious, erect, cylindric, obtuse, pale brown, 

 stipitate ; stipe short, one-half to one-third the total height, 

 i-it|- mm., black, slender, even ; hypothallus thin, scanty, trans- 

 parent or white ; columella black, tapering gradually to the apex, 

 or very near it ; capillitium very dense, formed of flexuous 

 fuscous threads, branching abundantly, especially outwardly, 

 and ending in numerous short free tips ; spores covered with 

 distinct but scattered warts, pallid, tinged with purple. 9-10 p. 



This species in form and stature closely resembles C. typhina, 

 but differs in the capillitial structure and the episporic markings. 

 In these particulars it more nearly corresponds with C. pulchella, 

 from which its slender cylindric form and blunt, sometimes 

 widened, apex distinguishes it, and with C. eqnalis, which is a 

 very much larger species, and has smaller, darker, less closely 

 warted spores. C. subccespitosa Pk. is a little stouter than the 

 type, has the sporangia wider, but the spores are just the same. 



Not common. New York, Ontario, Ohio, Pennsylvania, 

 Illinois, Iowa, Washington. On rotten wood, August. 



10. COMATRICHA SUKSDORFII Ell. and Everh. 



PLATE XI., Figs. 9, 10, 11. 



1882. Stemonitis suksdorfii Ell. and Everh., Dull. Washb. Coll., Vol. I., 



p. 5. 



1892. Stemonitis stiksdorfii Ell. and Everh., Mass., Mon., p. 76. 



Sporangia scattered in small tufts or gregarious, cylindric, 

 obtuse at both ends, widened above, black, stipitate ; stipe jet 



