Box.— Vol. I.] HARKNESS—CALIFORNIAN HYPOGMI. 275 



93. Tuber (Sphserogaster) Eisenii, sp. no v. 



Irregularly oblong, 3 cm. in diam., common integument smooth; gleba 

 pale or whitish; veins large; asci ovate, stipitate, 1-2-spored, seldom more 

 than one; spores globose, dark brown, echinate, 18 11 in diam. 



Type, No. 196, Harkness Coll. 



In sandy places beneath vegetable humus, Auburn, 

 Placer County, Calif., May. 



Named in honor of Dr. Gustav Eisen of the California 

 Academy of Sciences. 



94. Tuber (Sphaerogaster) olivaceum, sp. no v. 



Semiglobose, 2 cm. in diam., color ferruginous brown, smooth; gleba oli- 

 vaceous; veins minute; asci ellipsoidal, markedly pedicellate, 2-4-spored; 

 spores globose, echinate, dark brown, 24 ,a in diam. 



Type, No. 197, Harkness Coll. 



Beneath vegetable humus. Auburn, Placer County, Calif., 

 May. 



Piersonia, gen. nov. 



Integument scabrous or warty; gleba showing a multiplicity of brownish 

 dots, orbicular or gyrose; asci nesting together; spores 3-4, alveolate. 



Named in honor of William M. Pierson, a member of the 

 California Academy of Sciences. 



95. Piersonia alveolata, gen. et sp. nov. 



Plate XLIV, Figs. 2oa-2o^. 



Diameter i cm., integument scabrous, color white, turning to sulphur; 

 gleba firm, citrine, cut surface showing a large number of orange-colored 

 dots; asci clavate, 60 x 80//, pedicel elongated (70^), 3-4-spored; spores alve- 

 olate, citrine, 24 ,u in diam. 



Type, No. 183, Harkness Coll. 



Beneath Ceanothtis, Auburn, Placer County, Calif., May. 



96. Piersonia scabrosa, sp. nov. 



Plate XLIV, Figs. lYU-ixe. 



Semiglobose, irregular, 2 cm. in diam., color chestnut-brown, surface rough; 

 gleba buff; asci obtusely saccate, pedicellate, 4-spored; spores globose, 

 white, alveolate, 20 ij. in diam. 



Type, No. 201, Harkness Coll. 



