REPORT OF THE SraTE BOrTANIST. 45 
AGaricus RopMant, PA. 
Rodman’s Mushroom. 
Pileus rather thick, firm, at first convex, then nearly or quite plane, 
with decurved margin, smooth or rarely slightly rimose-squamose on 
the disk, white or whitish, becoming yellowish or subochraceous on the 
disk, the flesh white, unchangeable ; lamelle close, narrow, rounded 
behind, free, reaching nearly or quite to the stem at first whitish, then 
pink or reddish-pink, finally blackish-brown; stem short, subequal, 
solid, whitish, smooth below theannulus, often furfuraceous or slightly 
mealy-squamulose above; annulus variable, thick or thin, entire or 
lacerated, at or below the middle of the stem ; spores broadly ellipti- 
eal or subglobose, generally uninucleate, .0002 to .00025 in. long, 
.0U016 to .0002 in. broad. 
Plant 2 to3 in. high; pileus 2 to 4 in. broad; stem 6 to 10 lines 
thick. 
Grassy ground and paved gutters. Astoria, Long Island. Rev. W. 
Rodman. Washington Park, Albany. May to July. 
This species is intermediate between A. campestris and A. arvensis, 
from both of which it may be distinguished by its narrow lamelle, 
solid stem and smaller, almost globose, spores. In size, shape of the 
pileus and general appearance it most resembles A. campestris, but in 
the whitish primary color of the lamellz and in the yellowish tints 
which the pileus often assumes, it approaches nearer to A. arvensis. 
The pileus, which is usually smooth, occasionally manifests a tendency 
to crack into small areas or scales on the disk, The flesh is quite | 
thick and firm, its thickness generally much exceeding the breadth of 
the lamelle. This character, together with the solidity of the stem, 
indicates a disposition in the species to produce flesh rather than fruit 
and may make it more desirable for cultivation than the common 
mushroom. ‘'he length of the stem, in all the specimens I have seen, 
is less than the breadth of the pileus. Its shape is nearly cylindrical. 
The annulus is generally rather thick and sometimes projects both 
above and below in such a manner that it appears like a grooved band 
or collar surrounding the stem. In some instances it is so near the 
base that it suggests the idea of a volva. Its lower or exterior surface 
is occasionally rimose, thereby indicating another point of resemblance 
between this species and A. arvensis. In this respect, as well as in its 
solid stem and narrow lamelle, it also approaches A. augustus, a large 
and showy European species which has not yet occurred with us, but 
which may be known by its lamelle changing at once from the pallid 
color of immaturity to the dark-brown hue of age, without exhibiting 
any intervening pinkish tints. 
