1916] CURRENT LITERATURE 329 
fornicus (Murrill),* the last being subtomentose. In others the gelatinous 
matrix is firm and the pileus not viscid, or slightly so when wet, as in B. edulis 
and its variety separans. 
orms with a somewhat similar structure of the pileus present three zones: 
(1) in B. Eastwoodiae (Murrill),* form A, there is an outer zone of vertical 
interwoven brownish hairs which sometimes gelatinize to such an extent as to 
Ppear, an intermediate zone of compactly woven hyphae, and the 
looser aa (2) i es B. Eastwoodiae, form B, the outer zone consists of rather 
distan compact brown rind f interwoven hyphae; while (3) 
in B. Pahoa Somni E, dave is a zone of densely interwoven, sual brown 
hyphae between the palisade of hairs and the loose trama. In other species 
the structure of the pileus is more homogeneous, consisting of interwoven 
hyphae, larger and with a more open mesh in the trama, smaller and more 
compact and dark colored in the “‘rind.’”’ Such species have a glabrous pileus, 
as in B. auriflammeus and B. Frostii, there being 3 zones of different density. 
The hymenophore (=stratum of tubes) is very uniform in the species 
studied. Cystidia are said to be wanting in most of those examined. In B. 
granulatus and B. californicus the cystidia form tufts of clavate cells which 
arise in the trama and project beyond the surface of the hymenium. They 
also occur on the dissepiment edges and on the stem. In B. duteus the tufts 
of cystidia are smaller. 
The general structure of the stipe is quite uniform. The hyphae in general 
are parallel with its axis, in some species almost strictly parallel, in others more 
or less interwoven. The central portion is loose and the hyphae of larger 
diameter; the outer portion compact and the hyphae of smaller diameter.” 
The surface of the stipe, then, is often characterized by outgrowths of short 
hyphae, cylindrical, clavate, or capitate cells, either in tufts, or covering 
the entire portion of the stem, thus forming a palisade layer. In the latter 
case the author speaks of this palisade as the “rind” (in B. auriflammeus). 
The “context” here then includes all the hyphae which extend more or less 
parallel with the axis of the stipe, that is, both “rind” and “context” of species 
lacking the palisade layer. 
This palisade layer on the stipe in B. auriflammeus forms the tomentum, 
and in the opinion of the reviewer represents merely the vesture of the stem, 
not the cortex (“rind”). Cortex and medulla (‘context’) are of the same 
character as in those species with a smooth stipe, then, or where the ves- 
ture of the stipe is composed of isolated tufts of cells. This interpretation of 
the tomentum on the stipe of B. auriflammeus finds confirmation in the fact 
that the vesture of the stem is usually “reticulate” and represents very likely 
* Rostkovites californicus Murrill, Mycologia 7:44. 1915. 
” Suillellus Eastwoodiae Murrill, N. Am. Flora 9:152. 1910 
3 Absent or very rare in B. brevi ‘pes Pk., which MurRRILL unites with B. granulatus. 
“4 A general feature in the stipe of most agarics. 
