i-'i'^] GilJicy: A Revision of the Tuherales of California 305 



low base of vorrneosities, cells in more or less distinct radial rows and 

 elongating toward center of ascoearp, this tissue becoming smaller- 

 celled and, in primary cortex, changing to more or less connected 

 hyphal tissue to bases of acsi ; hymenium sometimes double, partitioned 

 into irregular, mostly bent "pockets" by strands of coi-tical tissue; 

 asci crowded, separated by fascicled {)arai)hyses ; asci more or less de- 

 formed by pressure, cylindrical to somewhat club-shaped, normally 

 8-spored but some spores often not maturing, not constricted between 

 spores, rounded at apex, 40 by 180-250^1; spores 1- or incompletely 

 2-seriate, globose, 28^0/i,, smooth and hyaline when young, at maturity 

 smoky yellow, densely covered by long, slender spines with enlarged 

 bases, bases often coalescing in groups and making surface of spore 

 appear irregularly rugose ; paraphyses 4-6^ in width, difficult to dis- 

 tinguish separately because of dense crowding between asci. 



"In sandy places under oaks. Wire Bridge, Placer Co., Calif., May." 



No. 25, Hk. Col. Type. 



"In rich sandv soil under oaks, Alameda Co., Calif., June." 



No. 18, Hk. Col. Type of M. candidum. 



"About 3 inches deep in soil under oak, Piedmont Park, Oakland, 

 Calif., Apr. 4, 1903." No. 98, U. C. Col. N. L. Gardner. 



"Hvpogaeous under Salix, Sunset Park, Santa Clara Vallev, Calif., 

 May 17, 1903." No. 145, U. C. Col. N.L.Gardner. 



"In gravel soil under Quercus agrifolia, Leona Heights, east of Oak- 

 land, Calif." "Under Arhutus Menziesii, Mar. 8, 1905." "Under 

 Quercus agrifolia, hills bv Lake Temescal, Oakland, Calif., Aug. 

 11,1905." 



No. 272, U. C. Col. Type of Pseudogenea californica Fischer. 

 N. L. Gardner. 



"Under Quercus agrifolia, Dimond Canvou, East Oakland, Calif., 

 Mar. 14, 1914." No. 40l" U. C. Col. N.L.Gardner. 



The plants found under No. 18 and labeled Myrmecocystis candi- 

 dum are apparently young specimens of No. 25, Hk. Col. The spores, 

 which are innnature, are similar to undeveloped spores found in No. 

 25, and the form and structure of the ascocarps of the two are identi- 

 cal. The spores of this species are very peculiar in their sculpturing. 

 The spines appear to be covered by a transparent membrane which 

 liolds them rigid, but where this has broken away leaving the ends 

 free, they are seen to be long and flexible, tapering gradually from an 

 enlarged base. The coalescing of these bases in groups of irregular 

 lines gives the sculpturing a netted appearance, but the extent of such 

 coalescence varies greatly in different spores of a single plant, and 

 often every gradation is found ])etween spores whose S])ines are en- 

 tirely separate and those whose surfaces are completely covered by a 

 network of connected bases. The ends of the spines are not united in 



