24 
On the ground. Guernsey (Marquand). 
A very distinct species, allied to Polystictus perennis, but much 
stouter, and without a distinct stem; sometimes extending equally on 
every side from a central point, solid, pileus flat and not at all de- 
pressed; at other times spreading on the ground as an irregularly 
lobed body, from a central or excentric stout, stemlike, short base. 
Bertia collapsa Rom., Bot. Notiser, 178, 1892. Perithecia usually 
densely gregarious, although sometimes scattered ; seated on a 
brownish subiculum formed of branched, septate, intricately inter- 
woven hyphz about 6m thick, obconic, upper surface slightly 
convex, densely but very minutely warted, with a central papilla, 
black, opaque, about 2 mm. diameter, when old collapsing and be- 
coming strongly concave above. Asci clavate, apex rounded, wall 
thin, 40-60 x 10-12 ; spores irregularly 2-3-seriate, elliptic-oblong, 
hyaline, smooth, I-septate, 10-15 x 4-5u, Paraphyses absent. 
On dead stems of Ribes rubra and R. Grossularia. Guernsey 
(Marquand). 
Forming dense black patches on the wood and bark. Hitherto 
only recorded from Sweden, where it grew on bark of Pyrus Aucuparia. 
Verticillium Marquandii Massee. (sp. nov.) Patches broadly 
effused, minutely velvety, pale lilac at first, becoming deep lilac or 
amethyst coloured at maturity. Vegetative mycelium creeping, 
branched, septate, hyaline, slender, giving origin to numerous slender, 
erect, fertile branches, which are either simple, or usually with I-4 
short, alternate, or opposite branchlets, rarely in whorls of 33 tips of 
branchlets, also tip of main axis bearing a whorl of 3-6 flask-shaped 
conidiophores. Spores smooth, hyaline, lemon-shaped, solitary on 
the tips of the conidiophores, or rarely in chains of 2 conidia, 3-3°5 
X 1°5-2u. 
Parasitic on the gills of Hygrophorus Virgineus. Guernsey 
(Marquand). Common. 
A very beautiful mould, and very conspicuous on account of its 
clear lilac colour. Numerous specimens were received during the 
months of October and November, 1897. 


