320 University of California Puhlications in Botany [Vol.6 



Tuber (Sphaerotuber) calif ornicum Hk. 



Plate 29, fig. 20 



Tuber Magnatum Hk. non. Pico. Proe. Cal. Acad. Sci., 3d ser., vol. 1, no. 8 



(1899), p. 272. 

 Tuber puberulum Hk. non B. et Br., Proc. Cal. Acad. Sci., 3d ser., vol. 1, 



no. 8, p. 273. 



Ascocarp whitish to ochraceons, often caespitose, 1.5-2.5 cm. in 

 (liam., much lobed and Avrinkled ; surface unevenly pubescent ; gleba 

 brown, marbled with large, light-colored veins; cortical tissue pseudo- 

 parenchymatous, cells varying little in size, compressed laterally, oc- 

 casional cells of surface layer developing into long septate hairs ; outer 

 wall of surface cells thickened ; subcortical tissue of very loose, irregu- 

 lar, branched hyphae ; thickness of peridium 200;u. ; venae externae very 

 large, branching, irregular in width, filled with loose, branched 

 hyphae ; tissue between asci more compact than venae externae, but 

 of coarse structure ; venae internae wanting ; asci short-stipitate, semi- 

 globose to globose, 72-88 by 72-lOOja, 1-4-spored ; spores dark brown, 

 globose, 40-48/i., coarsely alveolate, 3 to 9 (generally 6 or 7) alveoli 

 across diameter ; epispore 4— 8/x thick. 



' ' Under oaks beneath vegetable hmnus upon a hillside. Laundry Farm, 

 Alameda Co., Calif., March." No. 150, Hk. Col. Type. 



"In oak forest, San Kafael, Marin Co., Calif., March." "Under oaks. 

 Wire Bridge, Placer Co., Calif., March." 



No. 62, Hk. Col. Referred to T. Magnatum. 

 "Growing amongst decaying pine bark in forest, Donner, summit of 

 the Sierra Nevada mountains, 7,000 ft., Julv; under Lihocedrus, 

 Towles, Placer Co., Calif." 



No. 36, Hk. Col. Referred to T. puhenihim. 

 "U. C. Campus, Berkeley, Calif., Jan. 7, 1903." 



■ No. 60, U. C. Col. N. L. Gardner. 



"Under Querent agri folia. U. C. Campus, Berkelev, Calif., Dec. 12, 



1904." No. 228, U. C. Col. N.L.Gardner. 



"Under Quercus agrifolia, U. C. Campus, Berkeley, Calif., Dec. 29, 



1904." No. 239, U. C. Col. N.L.Gardner. 



"U. C. Campus, Berkeley, Calif., Mar. 20, 1915." 



No. 426, U. C. Col. N. L. Gardner. 



This species, which is found in the Harkness collection under three 

 numbers, and referred respectively to T. calif ornicum, T. puhcruhiDi. 

 and T. Magnatum, differs so distinctly from the latter two and from 

 all other described species of which record has been found, that it has 

 been allowed to remain under the name of T. californicuni. There is 

 no indication, whatever, either in tlic frcsli or preserved material ex- 

 amined, of the white flecks considered an iinjioi'tant character of the 

 surface of T. puberulum; the spores are regularly globular rather than 



