158 Thirty-fifth Keport ok the State Museum. 



cal form of the species, a form which I have not observed here, and 

 which probably does not occur with us. It is a little remarkable that 

 none of the published descriptions and figures of this species, so far 

 as I have seen them, give the spore characters. Those characters are 

 often of the utmost value in distinguishing closely related species. 

 In regard to the spores of' A. metulcesporus, the descriptions do not 

 all agree, but the discrepancies are probably due to variability in the 

 spores and to lack of care in the examination. In Epicrisis they are 

 said to be twice as large as in the allied species, and acutely pointed at 

 one end. In Grevillea, Vol. I, p. 55, they are said to be nine-pin 

 shaped or obliquely clavate. In Mycological Illustrations, by M. C. 

 Cuoke, they are represented as fusiform and acute at both ends. In 

 our plant they are nearly fusiform in shape, but varying somewhat in 

 the character of the apices, which are sometimes acute, sometimes 

 blunt, and sometimes acute at one end and blunt at the other. The 

 species has a wide range, having been found in Ceylon, England and 

 Alabama. 



ANNULOSI. 



Annulus superior, fixed, subpersistent, universal veil adnate to the pileus. 



The species of this tribe are chiefly distinguished by the well-de- 

 veloped but fixed and rather persistent annulus. They are generally 

 larger and more fleshy than those of the preceding tribe. In some 

 species the lamellae, and in others the whole plant changes color in 

 drying. 



Agaricus cep^estipes, Sow. 



Onion-stemmed Agaric. 



Pileus thin, at first ovate, then campanulate or expanded, umbonate, 

 soon adorned with numerous minute brownish scales which are often 

 granular or mealy, plicate striate on the margin, white or yellow, the 

 umbo darker ; lamellae thin, close, free, white, becoming dingy with age 

 or in drying ; stem rather long, tapering toward the apex, generally 

 enlarged in the middle or near the base, hollow, annulus thin, subper- 

 sistent; spores subelliptical, uninucleate, .0003' — .0004' long, .0002' 



— .0003' broad. 



Plant often caespitose, 2' — 4' high ; pileus 1' — 2' broad; stem 2" 



— 3" thick. 



Rich ground and decomposing vegetable matter. Also in graperies 

 and conservatories. Buffalo, G. W. Clinton. Albany, A. F. Chatfield. 



The species takes its name from the peculiar oblong swelling or en- 

 largement in the middle or the lower part of the stem. It is similar to 



