1916] Yates: Histology of Califoniian Boletaceae 227 



here my indebtedness to Dr. ]\Inrrill of the New York Botanical Gar- 

 den, both for the use of material and for his assistance in the identi- 

 fication or verification of all my specimens. 



Ceriomyces auiilhmniius (Berk, and Curt.) Murrill 

 Ceriomyces crassus var. separans (Batt.) Peck 

 Cerioinyt'os comiiuuiis (Bull.) ^Furrill 

 Suillellus Frostii (Eussell) Murrill 

 Rostkovites granulatus (L) P. Karst 



Individuals of the following eastern species were also seen by the 

 writer, but due to lack of material or other reasons thcii- hi.stology wa.s 

 not thoroughly investigated : 



Gyroporus castaneus (Bull.) Quel 

 Ceriomyces eximius (Peck) Murrill 

 Ceriomyces auriporus (Peck) Murrill 



All of our Californian Boleti are terrestrial and probably sapro- 

 phytic upon decaying leaves and twigs. They are all fungi that inhabit 

 woods, none having been found in open fields or any considerable 

 distance from trees or bushes. Some of our species are restricted to 

 the vicinity of definite species or genera of the higher plants. Rostko- 

 vites granulatus, our most common species, is never found except in 

 the vicinity of pine trees, usually Pi)tus radiata. Ceriomyces com- 

 munis occurs only near oak trees, usually coast live-oak {Qucrcus agri- 

 folia.) On the other hand, certain species appear to grow almost any- 

 where in moist, shady woods. Boletus luteus, for example, has been 

 collected under redwood {Sequoia sempervirens) , Douglas fir {Pse\{do- 

 tsuga taxifolia), madrone (Arhutus Menziesii), coast live-oak {Quercus 

 agrifolia), tan oak (Pasania densifiora) and Bishop pine {Pinus 

 muricata). 



Certain of the Boletaceae are reported to be poisonous l)ut in the 

 course of this study I have been unable to collect any information to 

 add to our knowledge of the edibility of our Californian species. The 

 Italians ni'c the only people in this region who use the Boleti for food 

 to any extent, 'i'hcy collect certain of the plants in considerable 

 quantities and even expose them for sale in their markets. It is prob- 

 able that not many of our species are poisonous, since I can find no 

 cases of reported mushroom poisoning in California attributed to 

 them. 



^lany of our species of Boleti are very subject to the attacks of vari- 

 ous species of insect larvae. The insects concerned havc^ nol been llior- 



