Nov. 1907] Tzco New Hypogaeous Secotiaceae 241 



raked off it is seen partially (up to about half) buried and looking 

 very much like a young- Russula of one or other of the common 

 red-topped species. The illusion is not dispelled when it is re- 

 moved from its place and examined, for the pseudo-lamallae 

 showing- at the base of the peridium give still a very decided 

 agaricoid appearance. When the gleba is cut across, however, 

 all doubt is removed, since, except for the percurrent stipe, the 

 structure is thoroughly hymenogastroid. The lacunae are regular 

 and open and there is no such inner indefinite and confusing 

 lamelliform structure as has been mentioned as occurring- in the 

 preceding species. A comparison of figures 2, 5, and 6 will show 

 what is meant better than words may describe. The basidia are 

 most commonly 2-spored in the specimens I have examined and the 

 spores while simply appearing rough under a moderate power 

 still show something of the irregular reticulation of raised lines 

 which appear distinctly when subjected to examination with an 

 oil immersion objective. In some specimens cystidia appear very 

 niimerous while in others few are to be seen. The affinities of 

 this species are very closely with E. Mattirolanits Cav., from which 

 it is to be distinguished by the color of the peridium, the more 

 rounded and thicker margins, and the smaller sculptured spores. 

 Dr. Ed. Fischer has kindly compared our specimens with an 

 original plant from Cavara and points out these distinctions. 

 From Secotium (Elasmomyces) Krjnkozvcnse Bucholtz and S. 

 (Elasmomyces) Michailowskiannm Bucholtz, so far as I may 

 judge from the descriptions, this species differs in color as well 

 as size and markings of the spores. These three species seem to 

 be the only Secotiums thus far described with which it is neces- 

 sary to compare our plan. 



University of California, Berkeley. 

 October 21, 1907. 



EXPLANATION OF PLATE I07. 



Elasmomyces russuloides sp. nov. 



1. General habit of a typical plant seen obliquely from below. X 2 diam. 



2. Half of a similar plant, divided longitudinally in the median plane. 



X 2 diam. 



3. Portion of a section across a trama-plate, showing the basidia and 



spores. X 1000 diam. 



Secotium tenuipes sp. nov. 



4. General habit of a typical plant, seen from the side. 1 diam. 



5. Half of a similar plant, divided longitudinally in the median plane. 



X 1 diam. 



6. Similar view of another typical plant. X 1 diam. 



7. Surface view of medium transverse cut of the pileus, showing perid- 



ium, gleba, and stipe. X 2 diam. 



8. Small portion of the hymenium, showing basidia, spores, and cystidia. 



X 1000 diam. 

 Drawings prepared by H. N. Bagley under direction of the writer. 



