42 THE GASTEROMYCETES OF THE UNITED STATES AND CANADA 



"Odor strong and penetrating, somewhat like that of onions" (Pennington). 

 This plant in the dried condition shows considerable resemblance to M. variegalus 

 but can readily be separated from that by the much larger spores. 



Illustrations: Bucholtz. Beitr. Morph. und Syst. Hypogaeen (Tuberaceen und Gastromyceten), 

 pi. 1, figs. 22-24. 

 Hesse. Hypog. Deutsch., pi. 4, figs. 6-9; pi. 5, fig. 4; pi. 6, fig. 2. 

 Lloyd. Myc. Notes, fig. 2005. 

 Massee. Brit. Gastromycetes, pi. 1, fig. 5. 

 Smith. Brit. Basidiomycetes, p. 488, fig. 141. 

 Tulasne. Fungi Hypogaei, pi. 2, fig. 5; pi. 12, fig. 5. 



New York. Syracuse. Pennington, coll. (Herb. N. Y. St. Coll. Forestry). 



LEUCOGASTER Hesse 



We have been able to study only one species of this genus, and take the generic 

 as well as other specific descriptions from Zeller and Dodge, who have recently mono- 

 graphed the American species, five of which they record from the eastern United 

 States (Ann. Mo. Bot. Gard. 11 : 389-408. 1924). 



"Fructifications globose to irregular, hypogaeous to emergent, fleshy or waxy; 

 fibrils sometimes present, leading to rhizomorphs; columella, stipe, and sterile base 

 absent; peridium usually thin and fragile, sometimes rupturing at maturity; cavities 

 frequently polyhedral, usually filled with spores embedded in a gelatinous mass; septa 

 homogenous, with or without a distinct trama, often gelatinizing at maturity; basidia 

 from subglobose to ovoid and subcylindric, mostly 4-spored, sometimes 3- or 5-spored; 

 spores hyaline or slightly colored, with various surface markings embedded in a gelati- 

 nous spherical mass." 



Key to the Species 



Peridium double, thin, 60-80/* thick, white spotted with yellow, becoming reddish on drying; basidia 

 linear-oblong L - luteomaculatus (p. 42) 



Peridium single, although sometimes with flocculent patches, then much thicker 

 Peridium thin (under 180/* when dry) 



Tramal plates 40-50m thick; spores globose, 8-1 1m L. araneosus (p. 43) 



Tramal plates 70-1 50 M thick; spores subglobose, 8.5-11 x 11-14 M L. caroliniamis (p. 43) 



Peridium thick (over 200/*) 



Septa thin, 60-120/x thick; basidia clavate, 22 x 8m; spores 11-13/* in diameter, sterigmata 



short L. anomalus (p. 44) 



Septa thick, 150-200/* thick; basidia pyriform 



Basidia 20-24 x 12/*; spores 12-16/* in diameter; sterigmata short L. badius (p. 44) 



Basidia 7-8 x 5-6/*, pedicellate; spores 8-10/* in diameter, sterigmata long 



L. fnhimaculosus (p. 44) 



Leucogaster luteomaculatus Z. and D. 



"Fructifications globose, 2.5 x 1 cm., drying 1.5 x 0.8 cm., chalk-white with yellow 

 flecks (Thaxter's field notes), becoming ox-blood red to garnet-brown on drying, surface 

 uneven, shining; fibrils anastomosing, free in places, black, shining; peridium 60-80/* 

 thick, duplex, outer layer readily separating from the inner, leaving patches 20-30/* 

 thick' of large, septate, olive-brown hyphae, inner layer 40-55/* thick, of slender, reddish 

 brown, granular, closely woven hyphae; gleba milk-white when fresh, drying cinnamon 

 or clay-color; cavities globose to polyhedral, filled; septa thin, 50-60/*, hyaline, of 

 large, parallel, thin-walled, hyaline hyphae, scissile; basidia hyaline, 7 x 12/*, narrowly 



