NOTICES OF NORTH AMERICAN FUNGI, 157 



49G. Nemaspora Rhoidis. B. «$■ C— Pustulis basi dilatatis cortice 

 arete cinctis extna nigris intus pallidia ; sporis oblongis hyalinis. 



On Rhus. Maine. Rev. J. Blake. No. 6297. 



Pustules prominent, closely surrounded by the bark, except at 

 the apex, brown pallid within, spores hyaline, -0000-0005 long, 

 obtuse at either end, about \ wide 



497. Nemaspora Russellii. B. & C— Pustulis gregariis epider- 

 mide pallida ferine tectis ; sporis fusiformibus pedicellis hyalinis 

 sequatis. 



On branches of Robinia. New England. Russell. No. 5911 bis. 



Pustules gregarious, almost covered by the pallid cuticle ; spores 

 fusiform, rather oblique, -0005--0004 long, seated on pedicels of 

 the same length. 



498. Nemaspora viridis. B. $ C— Pustulis truncatis promincn- 

 tibus; sporis viridibus ellipticis e pedicellis elongatis hyalinis ori- 

 undis. 



On birch. No. 4899. 



Pustules prominent, black, truncate above ; spores elliptic or 

 elliptic-oblong, about -0006 long, but rather variable in size, about 

 half as much wide, green, granular within, springing from slender 

 hyaline elongated pedicels. 



499. Nemaspora brachyspora. B. # C— Pustulis elevatis obtusis 

 libeiris, sporis curvulis reniformibus. 



On bark. No. 2647 bis. 



Pustules scattered, obtuse, free ; spores about -0006 long, half as 

 much wide, reniform. 



500. Nemaspora erythraea. B. $ C— Pustulis epidermide tenui 

 tectis, gregariis, intus cellulis globosis prasditis ; sporis minutissimis. 



On twigs of roses. No. 3188. 



Pustules minute, gregarious, covered with the thin cuticle, de- 

 pressed, with a single row of globose cells within, the walls of which 

 are covered with extremely minute, shortly oblong spores. 



REHM'S ASCOMYCETEN. 



No mycological student of the present day need complain of any 

 lack of published specimens to assist him in his researches. Since 

 the publication of Fries' Scleromycetes Suecia?, Mougeot and 

 Nestler's Stirpes Cryptogamicce, etc., this method of diffusing a 

 knowledge of the science has found much favour amongst fungo- 

 logists. Each year brings into existence some fresh series of 

 " Exsiccati." There are in course of publication at the present 

 time, amongst many others, collections representing the mycologieal 

 flora of Austria, of Great Britain, of the European Continent, and 

 we believe, one is in contemplation which will include species from 

 all parts of the world. Dr. Rehm, of Windsheim, has undertaken 

 the illustration, by actual specimens of the Ascomycetes, a class of 



