226 University of California Publications in Botany [Vol. 6 



former has been collected from October until February, and the latter 

 from October until April, or. in other words, at any time during the 

 rainy season. 



In addition to the plants secured by the writer a number of forms 

 have been brought in by others, particularly several specimens from 

 Mendocino County furnished by Mr. R. P. Brandt. 



The Boleti of California have not been sufficiently worked over 

 to make it possible to state definitely the number of species occurring 

 in this region. 



Harkness and Moore (1880) list sixteen species of Boleti occurring 

 in California, but such of their collections as may have been pre- 

 served were probably destroyed in the San Francisco fire of 1906, so 

 that a verification of this list has been rendered difficult or impossible. 



Peck (1889) names eleven species as occurring in California, but 

 quotes Harkness and Moore as his authority in each case. Strange 

 to say, Peck does not mention the occurrence of Boletus granulatus 

 {Rostkovites granulatus) in California, where it is our most common 

 species and occurs under pines in abundance. 



In southern California McClatchie, who collected extensively in 

 that region, mentions only Boletus subtomentosus, now Ceriomyces 

 subtomentosus according to Murrill. 



Murrill (1910) describes three new species of Boleti from Cali- 

 fornia, Suillellus Eastwoodiae Murrill, Ceriomyces flaviporus (Earle) 

 Murrill, and Ceriomyces tomentipes (Earle) Murrill. In addition to 

 these plants there are some eleven species listed by Murrill which may 

 be expected in California. These eleven species include forms whose 

 names are synonymous with species li.sted as occurring in California 

 by Harkness and Moore, and plants which we may expect to find here 

 from an extension of their range as given by Murrill. 



Of these plants the following list includes the forms which I have 



been able to collect and examine : 



Ceriomyces crassus Batt. 

 Ceriomyces communis (Bull.) Murrill 

 Rostkovites granulatus (L) P. Karst 

 Rostkovites californicus Murrill 

 Suillellus Eastwoodiae Murrill 

 Boletus luteus (L) Murrill 



The following are the species of eastern Boletaceae received through 

 the kindness of Dr. W. A. Murrill and which have been examined as 

 to their histology and other details by the writer. I wish to express 



