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University of California Publications in Botany [Vol. 6 



three; Tylopilus, four; Ceriomyces, forty-four; SuilleUus, five; Eost- 

 kovites, three; Boletus, four; Boletellus, one; Pulveroholetus, one; 

 Strohiloniyces, one; Boletinellus, three; Boleiinus, six. Subsequently 

 he has described one species of Gyroporus, five species of Ceriomyces 

 and one species of Rostkovites. 



The following tabulation shows the relation of the classifications 

 adopted by Fries, Peck, and ]\Iurrill : 



Fries (1836) 



Viscipelles 



Subtomentosi 



Calopodes 



Luridi 



Edules 



Favosi 



Versipelles 



Hyporrhodius 



Leneosporus 



Peck (1889) 



•Subpruinosi 



-Pulverulent! 



-Viscipelles 



Subtomentosi 



Laceripedes 



Calopodes 



Luridi 



Edules 



Boletus ananas: 



Strobilomyc^ 



Versipelles 



Hyporhodii 



Cariosi 



Boletinus- 



Muirill (1910) 



Pulveroboletus 



Boletus 



Rostkovites 



Ceriomyces 



SuilleUus 



Boletellus 

 Strobilomyces 



- Tylopilus 

 -Gyroporus 

 -Boletinus 

 -Boletinellus 



It is evident from the tabulation given above that INlurriU's work 

 has consisted chiefly in changing subdivisions to genera and in the 

 grouping of a large number of forms under the genus Ceriomyces. 

 The forms included in Ceriomyces by Murrill are those which, in the 

 earlier classifications, depended upon color or minor morphological 

 characters for their distinction. On the w^hole, jMurrill's work has 

 tended toward a classification based more nearly upon what appear 

 to be the natural relationships within the family rather than upon 

 mere superficial resemblances due to color or surface characters. The 

 chief difficulty one finds in working witli his keys is in the genus 

 Ceriomyces, which includes a great number of species depending, as 

 in the earlier classifications, upon color or slight .structural differ- 

 ences. This genus seems to be a sort of a general assembling-ground 

 for forms which do not fit anywhere else, and it does not seem to be 



