[Vor. 7 
220 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
54645); Tepeite Valley, Guernavaca, W. A. € E. L. 
Murrill, 408, comm. by N. Y. Bot. Gard. Herb. (in Mo. 
Bot. Gard. Herb., 54544); Xuchiles, Cordoba, W. A. & 
E. L. Murrill, 1209, 1210, comm. by N. Y. Bot. Gard. Herb. 
(in Mo. Bot. Gard. Herb., 54598, 54599). 
72. S. heterosporum Burt, n. sp. Plate 6, fig. 72. 
Type: in Mo. Bot. Gard. Herb. 
Fructifications coriaceous, thin, resupinate, orbicular, becom- 
ing confluent, sometimes reflexed, with the upper surface villose, 
bister, somewhat concentrically sulcate and zonate, the margin 
entire, whitish; hymenium even, somewhat velvety, bister, becom- 
ing light drab and somewhat pruinose in the center with age; in 
structure 300-500 y thick, the intermediate layer with a darker 
zone on its upper side and composed of loosely and longitudinally 
arranged, slightly colored hyphae 3-31 y in diameter, many of 
` 
NE 
AN WM i 
TA 
Fig. 43. S. heterosporum. Section X 90; hyaline cystidium, c, colored cystidium, 
c', hyaline spores, s, colored spores s’, X 665. 
which curve into the hymenium and often become there as dark- 
colored as conducting organs and sometimes incrusted ; hyme- 
nium 70-120 y thick, becoming more or less zonate, with cystidia 
incrusted starting from all parts of the layer, 30-35 X 6-7 My 
protruding up to 15 y, often colored under the incrustation in 
the deeper layers of the hymenium; paraphyses filiform, 2 u 
in diameter, branched, numerous at the surface of the hymenium; 
basidiospores hyaline, even, 8-931 u, borne 4 to a basidium; 
ochraceous spores of the same form and dimensions as the 
basidiospores often occur copiously imbedded throughout the 
hymenium. 
