JOURNAL OF MYCOLOGY. 



VoL I. MANHATTAN, KANSAS, DECEMBER, 1885. No. 12. 



SYNOPSIS OF THE NORTH AMERICAN SPECIES 

 OF ASTERINA, DIMEROSPORIUM AND 

 MEMOLA. 



BY GEORGE MARTIN. 



[Continued frona page 139.] 



DIMEROSPORIUM. 



DiMEKOSPORiUM, Fckl. Symb. Myc. p. 89. (Etym. dls, meros and 

 spora^ a spore divided into two parts.) Peritbecia superficial, globose, 

 astomous, membranaceo-carbonaceous ; mycelium copious. suDcrusta- 

 ceous, black, bearing conidia. Asci short, S-spored ; sporidia didymous. 

 hyaline or brown. Sacc. Sylloge I, p. 51. 



This genus is made up principally of species taken from Asterina 

 and Meliola, and though this separation appears at best to be an arbi- 

 trary one, it has been thought that less confusion might arise by adopt- 

 ing it for the present. 



1. DI3IEROSPORIU3I CLAYULiOEPtA (Cke.), Asteriiia davuligera, Cke., 

 Grev. VI, p. 142. Ravenel F. A., i^o. 76. 



Mycelium brown black, remotely septate, branching, epiphyjlous. 

 spots orbicular, of ten coalescing, crustaceous, conidia light brown, obo- 

 vate, 3-septate, pedicel hyaline, -±5 — 48 x 9—12 fj- ; perithecia black, sub- 

 globose, becoming depressed and at last scutellate from ruputure, 250 .'J- in 

 diameter consisting of coalesced brown black, radiating hj^phse, covering 

 alight brown, membranous sac; asci oval, 30x18/^- ; sporidia hyaline, 

 oval or obovate, 1-septate, 21 x 6 



On leaves of Vaccinia and Andromeda, Florida. 



2. DniEROsroiiTCM CArxoiDES (Ell.) Asterina capnoides, Ellis. Am. 

 Xat. 17, p. 318. 



Mycelium brown black, branciring. septate, hypophyllous ; conidia 

 brown, oval. 1-septate, 10—12x6/^-; macro- conidia- brown, pedicellate. 



