358 
ground for stating that these two forms of pycnidia belong 
to the same species is: (1) that they bear exactly similar 
spores; and (2) that they both continually occur together on 
the same leaf, an unbroken series being then often traceable 
from the largest to the smallest. ne can, of course, find 
pycnidia bearing allantoid spores, and others bearing ovoid 
spores of various sizes, on the same leaves of Holly, often in 
company with the Ceuthospora, but in that case no one would 
dream of suggesting that there is any connection between them. 
CYTOSPORINA. | 
Stroma Valsa-like, verruciform or effused, on bark or wood, 
hard, brown-black outside, paler within. Pycnidia more or less 
immersed, even emerging completely, plurilocular or pseudo- 
locellate, opening by one or more ostioles. Spores filiform, 
curved, hyaline, continuous, over 12 u long. 
The best known species are pycnidial stages of Hutypa and 
Cryptosphaeria, and therefore are distinct from Cytospora more 
deeply than is implied in mere length of spore. Others are 
assigned to Hutypella, but possibly in error. 
Cytosporina Acharii Grove, comb. nov. Cytospora Acharvi Sace. 
Syll. iii. 267. Allesch. vi. 566. Died. l.c. p. 369. 
Stroma widely effused, thin, black. Pyenidia partly immersed, 
seated on the wood, convex on a roundish base, unilocular, black, 
usually densely aggregated, with thick walls, opening by a narrow 
pore or slit. Spores filiform, curved or lunate, 13-15 yw long, 
at length issuing in whitish tendrils; sporophores fasciculate, 
about as long. - 
On decorticated branches, especially of Acer. Not uncommon. 
The pycnidial stage of Hutypa Acharii Tul. The pycnidia usually 
appear before the perithecia. 
Distrib. Europe, N. America. 
Cytosporina flavovirens Grove, comb. nov. Cytospora flavovirens 
Sace. Syll. iii. 268. Allesch. vi. 566. Died. l.c. p. 331 
Stroma thick, more or less effused, of a greenish-yellow colour 
within, but nearly black outside. Loculi totally immersed, very 
crowded, oblong, about $ mm. diam., with thick fleshy indefinite 
greenish-yellow walls, opening by an inconspicuous pore or slit. 
Spores linear-filiform, curved or lunate, 30 w long or more, nearly 
sessile, agglutinated, expelled in whitish tendrils which become 
darker with age. 
On bark or wood of Acer, etc. Rather common. The 
pyenidial stage of Lutypa flavovirens Tul. 
t has been recorded on many hosts (e.g., Fagus, Quercus), 
and can be recognised at once, on sectioning, by the peculiar 
colour of its stroma, which is that of flour of sulphur mixed with 
a little powdered charcoal. The pycnidia, which are not 
abundant, come before the perithecia. 
Distrib. Europe, N, America, 
