HYMENOGASTRACEAE 33 



latter, usually extends throughout the thickness of the peridium; while in the present 

 plant the yellow color is limited to the outer part, the inner part being a distinct rosy 

 salmon. The two plants are quite distinct in the color changes in the gleba, the present 

 plant showing no change in the gleba upon cutting, while in R. rubescens the cut surface 

 of the gleba changes to a distinct, rosy pink. Furthermore, the cavities of the gleba 

 in R. roseolus are larger than in R. rubescens, and the septa are considerably thicker, 

 more gelatinized and much less scissile. 



7207. On very damp, moss-covered earth, mixed wood, November 11, 1923. 



7212a. On mossy ground in old road, pine woods, near No. 7212, November 13, 1923. 



7214. On damp grass and moss covered earth, open place in thin mixed woods, November 17, 1923. 



7229. On ground, partly under pine needles, near New Hope Creek, December 1 1 , 1923. 



New York. Ithaca. On ground in moss. Whetzel, coll. (N. Y. St. Coll. Agric. Herb., No. 598, and 

 U. N. C. Herb.). 



Rhizopogon luteolus Fries & Nordholm emend Tulasne 



Plate 106 



We have not found this species in North Carolina but have studied a piece of a 

 plant preserved in formalin kindly sent us by Dr. Fitzpatrick from Ithaca, N. Y. 

 This same collection was examined by Zeller and Dodge and included under this species. 

 These authors give the size of the spores as 3-5 x 7-16yu, while our measurements are 

 3.7-4.6 x 8-13/li. They give the basidia as 9—10 x 12-13/*, with sterigmata as long 

 as the spores, while we find the basidia about 5.5/* thick in the uncollapsed half 

 by 24-28/1 long, and the spores nearly sessile, as is the case in most species we have 

 seen. In this material the thin-walled basidia had collapsed in the distal half or 

 throughout, but often were easily recognizable from the 2, 3 or 4 spores attached to 

 the end. We find the great majority of the cavities to be completely filled with spores. 



We have examined also a European specimen distributed by von Hohnel as R. 

 luteolus (Krypt. exs. No. 1607; U. S. Nat'l. Herb.), and find the surface to be distinctly 

 netted below, the peridium thin; chambers stuffed with spores; no olivaceous color 

 obvious in the gleba. Basidia 5.5-9 x 20-30/j, with 4-8 subsessile spores which are 

 3.2-4.4 x 5.5-S/i, rarely up to 11/u, mostly elliptic but some bent or angular. As usual 

 in RJiizopogon, the basidia are thin-walled and collapse after maturing the spores, and 

 the hymenium is also furnished with numerous elongated cells with highly gelatinized 

 walls. This plant differs from R. luteolus from Dr. Fitzpatrick in the size and numbers 

 of spores on the basidia and in the presence of gelatinized cells in the hymenium of the 

 European plant, but because of other resemblances and the scanty material we are 

 including both under this species. 



Krombholz's figure (Abbild. Schwamme, pi. 60, fig. 15) shows a green gleba, and 

 Hesse notes the gleba as becoming olivaceous. Tulasne rejects Krombholz's figure 

 as not being his interpretation of R. luteolus. 



The following description except for the italicized parts, which are ours, is from 

 Zeller and Dodge (Ann. Mo. Bot. Gard. 5:11. 1918) : 



Fructifications subglobose to oblong and often pear-shaped, diameter up to 3 cm. 

 when dry, color warm buff to mummy brown when dry: odor weak at first and later 



