1916] Yates: lUstologij uf Califontian Boletaceae 237 



them. These bodies are, however, confined to this one specimen and have 

 not been observed in any other material. They may be peculiar cystidia 

 or perhaps some parasite. They are 12 to 15/x in length and 6 to S/x in 

 their shorter diameter. The bodies project above the general level of 

 the paraphyses some 'A to 4/a. Scmietimes there are one oi* more light 

 yellow projections at the tip of these structures. No actual connection 

 was observed between these structures and the hj-menium. As is usual 

 among the Boleti. the basidia project slightly, in this case 3 to 4/>i, above 

 the paraphyses. The trama. or tissue between the tubes, is formed, 

 as is usual among the Boleti, of hyphae containing a granular substance 

 appearing gray under the microscope. These hyi)hae are but little 

 intertwined and maintain a position parallel to the long axis of the 

 tubes branching and curving outwards towards the layer of basidia 

 and paraphyses. 



The stipe is differentiated into context and a rind. The rind is 20 

 to 25^11 in thickness and is formed of hyphae, brownish in mass, and 2 

 to 4/x, in diameter. These hyphae are curved outward so as to form 

 a definite palisade layer. 



The hyphae of the context lie nearly parallel to each other and 

 to the long axis of the stipe. They are nearly hyaline, 4 to G/x in 

 diameter just beneath the rind, increasing in diameter to 6 or S/x as the 

 center is approached (pi. 24, fig. 22). 



Ceriomyces communis, Form B 



Plate 21, figure 4 



This is the Californian form referred to Ceriomyces communis by 

 Dr. W. A. ]\lurrill, which is most frequently met with. Form B differs 

 from the above description of Ceriomyces communis in the following 

 details. The surface of the pilciis i.s rarely red but usually varies 

 from grayish-brown to almost black in the living condition. The con- 

 text is rarely or never reddish beneath the cuticle and though the 

 flesh changes to blue when exposed to the air it then changes back 

 to white or soiiictiiiics to a hrownish cdjoi-. The pileus varies in diame- 

 ter from 3 to 11 cm.. \vhi('h is somcw li;it larger than is described. The 

 stipe is usually very short in pi-oportion to the diameter, frequently 

 contorted. The lower portion of the stipe is often swollen and at the 

 base it is abruptly attenuate, almost to a point. The stipe is somewhat 

 larger in diameter than described, never having been found wilh a 



