238 University of California PuUications in Botany [Vol. 6 



diameter below 0.8 era. in mature specimens and it may be even as 

 large as 3 cm. in large individuals. 



The description of this form is based upon the examination of a 

 considerable number of plants collected under No. 77 on the campus 

 of the University of California, No. 32, collected at Brookdale in the 

 Santa Cruz Mountains, and No. 245, collected at Point Reyes, Marin 

 County. In addition to the plants collected under the above num- 

 bers, field observations have been made of a large quantity of indi- 

 viduals on the campus of the University of California, in the Santa 

 Cruz IMountains, at Point Reyes, and in the vicinity of Muir Woods, 

 Marin County. 



Histology 



Under the microscope the pileus is seen to be covered with long 

 hyphae or hairs. These hairs are somewhat tangled, though they 

 maintain a position which is, in general, perpendicular to the surface 

 of the pileus. They are brownish in color, 25/x or more in length and 6 

 to 8/x in diameter. They are frequently septate but rarely branched, 

 and gradually pass over into the hyphae of the context through a loss 

 of their brownish color, more frequent branching and more tangled 

 appearance. The hyphae of the context are, however, of about the 

 same diameter as the hairs (pi. 23, figs. 18, ]7). 



The hymenium consists of paraphyses and basidia, the later pro- 

 jecting 4 to 6/j, above the paraphyses. No cystidia are present. The 

 trama is made up of long, rarely branched, hyphae filled with a 

 granular substance and lying nearly parallel to each other. 



The surface of the stipe is covered with a dense rind some 20/x 

 in thickness. This rind is formed of brownish hyphae about 4/x in 

 diameter lying parallel to each other and to the long axis of the stipe. 

 Scattered over the surface are peculiar tufts formed by certain of 

 the hyphae curving outward until they stand in a position perpen- 

 dicular to the surface of the stipe. The tips of these hyphae are swollen 

 to about 8 to lOfx in diameter. The tufts project a distance of 40 

 to 60fi above the surface of the stipe and they vary in diameter from 

 40 to lOOju,. These tufts resemble in some respects the "glands" formed 

 on the stipe in Rostkovites, to be discussed later (pi. 24, fig. 26). The 

 hyphae of the context become lighter in color and larger in diameter 

 as the center of the stipe is approached. The hyphae of the context 

 differ from those of the rind only in their lo.ss of the brown color. 

 At the center the hyphae are 10 to 12/a in diameter but vary con- 



