344 University of California Publications in Botany [Vol. 6 



Genea intermedia nom. nov. 



Ascomatibus rubro-fiiscis, leiite lobatis, ad superficiem papillis 

 rotundatis usque ad 0.3 mm. diam. indutis ; caverna fere simplice, 

 pariete interna lobos parvos exteruos parallelo sequente ; corticibus 

 primis et seeundis prorsus pseudoparenchymaticis ; hymenio raro fasci- 

 ciilis texti sterilis interrupto ; ascis cylindricis aliquando inter sporas 

 constrictis, 44 X 300fi ; sporis 1-seriatis, globosis, 36/x diam., juYenilibus 

 levibus hyaliuisque, maturis asperis papillis semiglobosis, e minutis 

 ad 5ft altis usque in spora singula variantibus, saepe irregulariter 

 anastomosantibus ; paraphysibus 4/i, crassis inter ascos stricte in fasci- 

 culis aggregatis. 



Hydnotrya ellipsospora 



Ascomatibus purpurascente-brunneis, 1.5 cm. in diam., subglobosis, 

 plicis laxis compositis, superficie minute pilosis ; glebae cavernis con- 

 nectis, latis angustisve, ascis paraphysibusque vallif ormibus indutis ; 

 paraphysibus in hyphis apice paululum tumidis ad foramina distincte 

 transf ormatis ; ascis cylindricis inter sporas non constrictis, 10 X 260yu, ; 

 sporis 1-seriatis, ellipsoideis 10 X 14ja, minute papillosis ; paraphysibus 

 ultra ascos non prominentibus, 2-5/^ latis. 



Tuber (Eutuber) levissimum 



Ascomatibus argillaceo-brunneis, 2 cm. diam., regularibus, super- 

 ficie levibus ; gleba dilute brunnea, venis magnis colore inconspicuis ; 

 textis corticis vix pseudoparenchymaticis, hyphis parallelis plus 

 minusve coalescentibus ad hymenium laxe connectis compositis ; venis 

 internis compactis, structura ad textas corticis approximatis ; ascis 

 subglobosis vel globosis, 50-80 X 70-100/x, 1-4 sporis ; sporis dilute 

 brunneis, globoso-ellipsoideis, 32-40 X 36-52fi, alveolatis ; alveolis mag- 

 nitudine et numero in sporis variabilibus, 3-10 X 4-13 trans diam., 

 sculptura 4|Lt crassa. 



Tuber (Eutuber) separans 



Ascomatibus plumbeo-purpureis, 1 X 1-2 cm., semiglobosis, eon- 

 volutis, superficialiter minute verrucosis, venis inconspicuis ; textis 

 corticis externi pseudoparenchymaticis interne compacte hyphalibus 

 gradatim transformantibus ; venis internis compactis, hyphis paral- 

 lelis, saepe anastomosantibus, ali(|uando pseudoparenchymaticis ; ascis 

 breviter stipitatis, semiglobosis, 56-68 X 60-92/a, 1-3- (rare 4-) sporis; 

 sporis alveolatis, alveolis 5-10 X 7-11 trans diam. 



Tuber (Eutuber) irradians 



Ascomatibus fuscis, 1.5 cm. diam., depresso-globosis, paululum 

 lobatis, superficialiter minute verrucosis areolis sparsis crassiore ver- 

 rucosis ; gleba primo alba deinde brunnea ; venis paucis parce ramosis, 

 albis; textis corticis pseudoparenchymaticis cellulis ordinibus plus 

 minusve distincte radiantibus ordinatis; textis subcorticis laxe hypha- 

 libus ; venis internis hyphis parallelis, separatis laxeque instructis ; 



