1916] Gilkey: A Revision of the Tuherales of California 311 



Ascocarp reaching 1.2 cm., lead-purple, minutely verrucose; asci 1-3-, 

 rarely 4-spored; spores rouud-ellipsoid, 40-48 by 48-56;tt; 5-10 by 



7-11 alveoli across diameters T. seiyarans. 



Ascocarp reaching 1 cm., depressed globose, minutely verrucose with 

 occasional more coarsely verrucose areas; asci 1-3- (generally 1-2-) 

 spored; spores 36-48 by 40-56/^; 3-8 by 3-9 alveoli across diame- 

 ters T. irradians. 



Ascocarp reaching 1.5 cm., brown, finely convoluted, verrucose; asci 

 1-5- spored; spores 24-30 by 28-48/^; 3-11 by 5-14 alveoli across 



diameters T. Gardnerii. 



Ascocarp 0.3 to 2.5 cm., silver white with occasional smooth areas of 

 darker color; depressed, irregular, convolute and often finely 

 wrinkled, more or less divided into minute areas by crossing of 

 wrinkles, sometimes having short, blunt hairs; asci 1-4- (generally 

 1-2-) spored; spores 28-44 by 38-56/^; 8-9 by 9-10 alveoli across 



diameters T. argenteum. 



b. Ascocarp even. 



Spores greenish yellow, 7-11 by 8-12 alveoli across diameters..r. australe. 

 Sphaerotuber. Spores alveolate, globose. 



Ascocarp very uneven, pubescent; spores dark brown, 40-48(a in diameter 



T. calif orniciim. 



OoGASTER. Spores spinose, ellipsoid or ovoid. 



Ascocarp minutely verrucose, at least about furrows; spores ovoid to long 



ovoid, 22-32 by 28-40^, with straight spines T. candidum. 



Ascocarp entirely smooth; spores globose-ellipsoid to globose, 20-32^, with 

 spines having recurved tij)S T. lignarium. 



EUTUBER 



Tuber (Eutuber) citrinum Hk. 



Plate 29, fig. 18 



Proc. Cal. Acad. Sci., 3d ser., vol. 1, no. 8 (1899), p. 271, pi. XLV, figs. 

 30a-30c: 



Ascocarp pale yellow, 2 cm. in diam., somewhat convolute, surface 

 entirely smootli, gleba somewhat lighter yellow than cortex ; veins in- 

 conspicuous ; coi-tical tissue pseudoparenchymatous ; cells nearly equal 

 in size, outer walls not thickened ; cells becoming gradually lengthened 

 laterally and changing to laterally extending, moi-e or less connected 

 liyphae of su])cortex ; thickness of peridium, 52()-540/x ; venae internae 

 and tissue between asci consisting of long-celled, loose, irregular, un- 

 connected hyphae, scarcely branched, 5/x thick ; venae externae filled 

 with coarse, much-branelied hyphae, 4-6/t thick, so regularly branched 

 and openly arranged as to appear reticulate ; asci somewhat long- 

 stipitate, semi-globose, 64—78 by 72-96/i., 1— 1-spored ; spores ellipsoid, 

 26-36 by 30-44/u., alveolate, 7 by 8 alveoli across diameters. 



"In forest, Tamalpais, Marin Co., Calif., ^Mav." 



No. 123, Ilk. Col. Type. 



