28 THE GASTEROMYCETES OF THE UNITED STATES AND CANADA 



20-200/u broad, hollow and lined with the hymenium. Septa 40-1 15/z thick, delicate 

 and intimately connected with the peridium, the threads that compose them much 

 branched, segmented, thin-walled, without clamp connections, 2.6-10.4/^ thick and 

 having much the appearance of those of the peridium. The hymenium contains no 

 obvious specialized cystidia, but certain cells among the basidia are of more fusiform 

 shape and these have not been seen to bear spores. 



Spores brown, fusiform, smooth, 3-3.5 x 7.8-10.4ju. Basidia short-clavate, 5 x 17/*, 

 2-4-spored, with slender sterigmata, which are 2.5-3.5/j. long. 



Gregarious and often crowded in large numbers in connected colonies in humus 

 just under or at the surface, and parasitic on rootlets of pine in damp places. 



Illustrations: Totten. Joum. E. M. Sci. Soc. 39: pis. 1-7. 1923. 



3990. On roots of Pinus cchinata and Pinus lacda, by branch south of Pritchard's, January 10, 1920. 



5383. Same place as No. 3990, July 22, 1922. 



6051. Roots of Pinus taeda, edge of swampy place north of cemetery, January 19, 1923. 



6057. Same place as No. 3990, January 28, 1923. 



Rhizopogon rubescens Tul. 



Plates 21, 22 and 106 



Plants above ground or partly or completely buried; single plants up to 5.7 cm. 

 broad by 4 cm. high (one cluster almost fused into a single plant 7 x 6.5 cms. by 4.5 cm. 

 high), irregularly subglobose, not rarely lobed, surface nearly smooth except for ridges, 

 channels and depressions, usually somewhat flattened above; not viscid; young under- 

 ground plants pure white when fresh, turning a distinct rosy pink when bruised; ex- 

 posed plants pure white at first, then yellowish with a tint of olive above (about citron 

 yellow, amber yellow or buffy citrine of Ridgway with russet areas where bruised), 

 remaining whitish below, becoming darker in age and an earthy tan with brown or black 

 areas on drying. Fibrils very few, usually absent above, innate-appressed on the sides, 

 becoming free below, and passing into one or several more or less conspicuous rhizo- 

 morphs; underground plants usually without any fibrils and with more or less con- 

 spicuous myceloid rhizomorphs which may be attached to the top, sides or base of the 

 plant. Peridium single, 0.4-0.6 mm. thick, pure white when fresh, turning fleshy pink 

 or rosy red throughout when cut, not viscid, composed of closely packed threads 4-9/i 

 thick, and numerous brownish amorphous crystals which do not change color upon the 

 application of 7% KOH. Gleba pure white when fresh, becoming pinkish when bruised 

 (often changing when simply cut with a sharp knife), after some hours losing the pink 

 color and becoming dull brown where cut, drying with a pale olive tinge; texture rather 

 tough and firm. Cavities irregularly flattened, 2-3 to a mm., not rarely up to 1 mm. 

 long, labyrinthiform; septa 85-1 00/* thick, composed of threads which become gela- 

 tinized; becoming very scissile upon maturing. 



Spores (of No. 7204) light brownish yellow, oblong-elliptic, smooth, 2-2.7 x 

 5.5-7.4/i. Basidia more or less obscure, clavate, 4.8-6.8 x 16-35/*; thin-walled, often 

 extending out beyond the hymenium, collapsing more or less completely after the spores 

 are formed; bearing 4-8 sessile spores; associated with the basidia in the hymenium are 

 numerous cells which become slightly gelatinized. 



Taste and odor at first practically none; plants drying without deliquescing are 

 nearly odorless, deliquescing plants becoming fragrant with an odor much like that of 

 strawberry preserves or scuppernong grapes, or decaying apples, in which condition the 

 plants are infested with numerous fruit flies. 



This species can be distinguished from R. luteolus as represented by a European 



