322 University of California Publications in Botany [Sfoi.. 6 



one end, 22-32 by 28-40/a; surface covered with minute or somewhat 

 coarse spines, 2-3/a in length. 



"Under dense clusters of Ceanothus, Auburn, Placer Co., Calif., May." 



No. 195, Hk. Col. Type. 

 "In clavev soil beneath oaks, Laundry Farm, Alameda Co., Calif., 

 ]\IarehJ Howards, Marin Co., Calif., May." 



No. 149, Hk. Col. Referred to T. Caroli. 

 "In sandy places beneath vegetable humus, Auburn, Placer Co., Calif., 

 May." No. 196, Hk. Col. Type ot T. Eisenii, 



"Beneath vegetable humus, Auburn, Placer Co., Calif., May." 



No. 197, Hk. Col. Type of T. olivaceum. 

 "Under Salix, 2-3 inches deep in leaf-covered soil, U. C. Campus, 

 Berkeley, Calif., Jan. 3, 1903." 



No. 45, U. C. Col. N. L. Gardner. 



"In clay soil under Salix, Quercus and Umhellularia, U. C. Campus, 



Berkeley, Calif., Mar. 29, 1903. Under Eucalyptus, U. C. Campus, 



Apr. 1, 1903." No. 91, U. C. Col. N. L. Gardner. 



"Same locality and date as preceding (immature)." 



No. 92, U. C. Col. N. L. Gardner. 



"Under oak in clay soil, Lake Temescal, Oakland, Calif., Apr. 11, 



1903." " No. 108, U. C. Col. N. L. Gardner. 



"In loamv, clayey soil among rocks, Lake Temescal, Oakland, Calif., 



Apr. 11, 1903.'" No. 109, U. C. Col. N.L.Gardner. 



"In clay soil under Quercus agrifolia, Leona Heights, Alameda Co., 



Calif., Mar. 4, 1 905. ' ' No. 273, U. C. Col. N. L. Gardner. 



"In soil under Quercus agrifolia. Thousand Oaks, Berkelev, Calif., 



Dec. 3, 1913." No. 425, U. C. Col. H. M. Gilkev. 



"Under Salix, U. C. Campus, Berkeley, Calif., Mar. 27, 1913." 



No. 442, U. C. Col. N. L. Gardner. 



"Under Quercus agrifolia, U. C. Campus, Berkelev, Calif., Mar. 27, 



1913." No. 443, U. C. Col. N. L. Gardner. 



This is the most commonly collected Tuher of California, but it 

 will be noticed from the localities cited above that the range of terri- 

 tory in which it has been found is not wide. In some characters it is 

 exceedingly variable, particularly in spore shape and sculpturing, in 

 the tissue of the gleba, and in the surface of the ascocarp. It was 

 tbought possible at first to separate at least two forms, but study of 

 a larger amount of material has shown that there is no apparent 

 definite interrelation of these characters, and that varying intermedi- 

 ate forms are found. For example, in No. 108 of the University of 

 California collection a verrucose ascocarp is associated with very loose 

 hyphal structure of the hymenium. No. 195 of the Harkness collec- 

 tion, on the other hand, is perfectly smooth except about the furrows, 

 wliilc the hyphae of the hymenium are more or less united, and in 

 places the tissue becomes apparently pseudoparenchymatous. No. 109, 



