CRIBRARIA 227 



the author has in mind a different form from that seen and described 

 in our territory and previously noted by the authors of Europe, 

 These from Schrader down, agree in portraying a brunescent form 

 with yellow spores; Mr. Lister enters it with the cyanic series and 

 so describes and figures it throughout. Schrader figures a nut-brown 

 species; Rostafinski uses that descriptive term in connection with the 

 general appearance when fresh, but gives the spore-mass yellow; 

 only in the stipe does he find another tint, nut-brown-purple. The 

 figure, 145 in the Monograph now before us portrays, except in color, 

 our C tenella exactly. Dr. Rex, Bot. Gaz., XIX., 398, compares 

 the present species with C. minutissima, and C. tenella with C. 

 dictydioides; which is correct for the American presentation of the 

 species named. C. dictydioides is certainly our presentation of C. 

 intricata, a geographic species at the least ; but if C. microcarpa is 

 purple we have of it no representation ; our forms under that name 

 are closely related to C tenella, a yellow-spored species, and might 

 perhaps be there referred ; have, however, somewhat larger spores. 



12. Cribraria violacea Rex. 



Plate XVII., Fig. 8. 

 1891. Cribraria violacea Rex, Proc. Phil. Acad., p. 393. 



Sporangia scattered or gregarious, very small, .2 mm. in diameter, 

 violet tinted, erect, stipitate short, about one-half the total height, 

 concolorous, slender, tapering upward ; calyculus crateriform, per- 

 sistent, or marked with minute plasmodic granules; the net rudi- 

 mentary or poorly developed, the meshes large, irregular, the nodules 

 also large triangular, violaceous ; spores pale violet in mass, by trans- 

 mitted light reddish, 7-8 fx, minutely warted. 



A very minute but well-marked species discovered by Dr. Rex 

 in Wissahickon Park, near Philadelphia, otherwise very rare. Lister, 

 however, reports it from England. In minuteness to be compared 

 with C. minutissima, from which its color instantly distinguishes 

 it. Dr. Rex reports the Plasmodium as "violet black." All our 

 specimens are on very rotten wood, basswood, Tilia americana. 



Pennsylvania, Illinois, Iowa. 



