Box.— Vol. I.] HARKNESS—CALIFORNIAN HYPOGMI. 273 



87. Tuber (Eutuber) gibbosum, sp. nov. 



Irregularly gibbose, 2 cm. in diam., color cinnamon-brown; gleba ochrace- 

 ous; septa white, tortuous, obscure; asci subrotund, 3-4-spored; spores dark 

 brown, ellipsoidal, echinate, markedly reticulate-alveolate, large, 24 x 36 //. 



Type^ No. 162, Harkness Coll. 



Under oaks, Mill Valley, Marin County, Calif., April. 



88. Tuber (Eutuber) excavatum Vitt. 



Tuber (Eutuber) excavatum Vitt., Monog. Tub., p. 49, Tab. I, Fig. 7. 



Subglobose, about an inch in diameter; peridium discrete, ochraceous, 

 minutely verrucose, firm; flesh horny, cinerous-red, liver-colored, or tawny; 

 veins pallid-ochraceous; the substance falls away in the center, so as to leave 

 a cavity, which has an opening at the base of the tuber; asci numerous, ellip- 

 soid, 2-4-spored; sporidia ellipsoid, yellowish, or pallid-tawny; epispore 

 largely foveolo-plicate. (Cooke's Handbook, Vol. II, p. 740.) 



No. 159, Harkness Coll. 



Beneath oaks in clayey soil, Laundry Farm, Alameda 

 County, Calif., April. 



The spore is somewhat larger (42/* in diam.) than in the 

 dried specimen, and like it coarsely reticulate. 



89. Tuber (Sphaerotuber) puberulum B. & Br. 



Tuber ( Splicer otuber) puberulum B. & Br., Ann. & Mag. Nat. Hist ist Ser 

 Vol. XVIII, p. 8r. 



Gregarious, irregularly sublobate, clothed with short, erect down, which 

 gives it to the naked eye a peculiar pearly appearance; the white spots are 

 very visible, even in dried specimens; peridium very thin and delicate, so 

 that the pinky-brown color of the flesh is apparent through it, often cracked; 

 veins white from a radiating base, in some individuals very few; sporidia 

 nearly spherical, reticulato-echinulate; odor of the radish. (Cooke's Hand- 

 book, Vol. II, p. 741.) 



No. 36, Harkness Coll. 



Growing amongst decaying pine bark in the forest, Don- 

 ner, summit of the Sierra Nevada mountains, 7,000 feet, 

 July; under Libocedrtis, Towles, Placer County, Calif. • 



(3) July 8, 1899. 



