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The sphaerulae small spherical bodies themselves are black as usual, lying hidden in the wood and pushing its surface out in a bubbly or papilla-like manner, which represents "goose-skin" not poorly. The blunt, naked ostioles protrude.
The latex or gel included within, when investigated under a microscope, consists of subcylindrical somewhat tube-shaped thecae spore-bearing sacs, typically hyaline translucent, which contain
Spores that are brownish-black, somewhat attenuated narrowed on both sides, varying in number from 3 to 9.
Table 1, Figure 8: how this species appears in natural size on the surface of the wood; a part of it is magnified by a lens in Figure 9: 'a' is a sphaerula still intact, 'b' the same dissected in half, 'c' three thecae with included spores, some of which are proposed in 'd' as even more highly magnified.
Ag. gregarious, with a fleshy pileus that is subumbonate, scaly-hairy, and red; lamellae that are reddish-white; and a fibrillose stipe, concolorous with the pileus.
It occurs here and there in pine forests.
The stipe is 3-4 inches high, ¾ inch thick, covered with hairy scales usually pointing upward, and inside, it is usually hollowed out by gnawing worms.