1916] Gilkeij: A Revision of the Tuherales of California 283 



because external openings had been observed, was reduced, tlie genus 

 being considered identical with Geopora, originally of the Balsaniia- 

 ceae. The latter family was left with the single genus Balsamia, its 

 relation to Geopora and Hydnocystis being questioned. To the Eutu- 

 beraceae were added the new genera Gyrocratera, Pseudobalsamia, 

 Piersonia and Myrmecocystis, as well as the genera Hydnoholites, 

 Choiromyces, and Genahea, which were earlier included witli the Plec- 

 tascales. 



Fischer's arrangement for tlie Eutuberales, which is essentially, 

 with some modifications and additions, that of Bucholtz, is represented 

 in the following table : 



Hydnobolites 

 Pseudobalsamia 

 t 

 ? 



{Stepliensia ) I 

 Pacliyphloeus f 

 ^ Piersonia 



• I 



4' ? 



Genea i" 



^ Myrmecocystis — >Genabea Choiromyces 



The Eutuberaceae are connected with the Helvellales by Spliaero- 

 soma. The status of the latter genus has been discussed by Setchell 

 (1910), who proves that Sphaerosoma Klotzsch belongs to the Pezi- 

 zales rather than to the Helvellales. Fischer may have referred here 

 to Sphaerozone ostiolatiim (Tul.) Setchell, which was named Sphaero- 

 soma ostiolatum by Tulasne, and which is probably a member of the 

 Helvellales. Tulasne 's figures of this species w^ere used by Schroter in 

 the Pflanzenfamilien (p. 172) under the name Sphaerosoma fuscescens- 

 Klotzsch. 



In the diagrammatic table, plate 26, I have shown an outline of the 

 relationships of the genera which I have had opportunity to observe, as 

 I understand these relationships at the present time. It will be noticed 

 that several genera mentioned by Fischer are absent. Of these Gyro- 

 cratera and Genahea have been omitted because no material has been at 

 hand for study, while Myrmecocystis is included as a subgenus under 

 Genea, the reasons for its reduction being found in the discussion of 

 that genus. Delastria and Terfezia have been transferred from the 

 Plectascales, tentatively, at least, for the presence or absence of definite 

 hymenium does not seem sufficient to separate them so widely from 



