6 
A MONOGRAPH OF THE BRITISH HYPOMYCES. 
Common in the conidiferons state upon various Boleti, especially 
B. scaber , chrysenteron , subtomentosus , badius, and edulis. It also 
occurs on Paxillus involutus , and upon Strobilomyces strobilaceus. 
Tulasne records it upon Scleroderma verrucosum, Octaviana astero- 
sperma, and Melanogaster variegatus. 
The ascigerous state is much the most uncommon ; it was found 
by the Rev. M. J. Berkeley at Coed Cocli, and in Chapelton wood 
near Forres by the Rev. J. Stevenson and myself in September, 
1879. The infected Boletus first shows signs of being affected 
with the parasite by producing upon its surface, at some point, a 
crop of microconidia. If it be examined in this stage, numerous 
mycelial tubes will be seen making their way downwards or to- 
wards the centre of the matrix. These penetrate with great 
rapidity into the substance of the Boletus. Immediately beneath 
the microconidia will now be found upon the same mycelium the 
macroconidia. They are at first almost colourless, but soon be- 
come faintly tinged with yellow, then golden. The whole fungus 
in a short time becomes reduced to a mass of golden powder, which 
falls to pieces on the gentlest touch. What the precise conditions 
are which favour the production of perithecia I have failed to dis- 
cover beyond that the too rapid development of Chlamydospores 
must not take place. 
Plate 146. a. Portion of a Boletus with the conidia growing in a white 
woolly mass upon its surface. Nat. size. 
b. Part of the same X 400. 
C. Microconidia x 400. 
d. Macroconidia X 400. 
e. Perfect fungus on Boletns. Nat. size. 
f. Perithecia X 20. 
g. Perithecium X 140. 
h. i. Asci and sporidia X 400. 
k. Sporidia X 600. 
2. Hypomyces asterophorus, Tul. Conidia, cylindrical, produced 
from the extremities of the branching mycelial tubes ; -Ol-'OIS 
mm. long by *0035 mm. wide. 
Chlamydospores produced singly upon the lower and thicker 
portions of the mycelial tubes ; spkserical, rough with warts, ap- 
pendiculate, eventually falling into a copious fawn-coloured powder ; 
*02 to ’025 mm. in diameter. 
Perithecia formed in and by the effused mycelial tubes, crowded, 
sessile, sphaerico-ovoid, more or less elongated at the neck; with 
acute, pervious ciliate ostiola ; pale yellow brown, sub-hyaline; T5 
mm. high by ‘OT-’Oy mm. wide. 
Asci broadly ovate, abruptly attenuated below. 
Sporidia narrowly lanceolate, curved, mucronate at either end, 
uniseptate, pale yellowish brown ; -025-*035 mm. long by ‘006 mm. 
wide. 
Hypomyces asterophorus, Tulasne. Sel. Fungi Carp. vol. hi., p. 
54, t. 9. 
