[Crown Copyright Reserved.] 
ROYAL wtih tae fbaes i Copgtted KEW. 
BULLETIN 
OF 
MISCELLANEOUS INFORMATION. 
Nolet} aus [1928 
I.—THE BRITISH SPECIES OF CYTOSPORA. 
W. B. Grove. 
If one finds in a dead or dying branch a number of little 
dark-coloured pustules, each about half a millimetre or so broad, 
which at first raise the surface in a conical or convex cushion 
and at length burst it at the summit, Probus a little roundish 
dise, of any colour from pure white to dingy-brown, in the midst 
of which is a black point, and if in moist weather there exudes. 
from the black point a whitish, yellowish, or reddish tendril of 
spores—the inference is that there lies before one a fungus of the 
form-genus Cytospora. 
The members of this genus of the Coelomycetes have spores. 
very similar to those of Naemospora, but can be distinguished 
“from them = the possession of an obvious pycnidial wall (seen 
on cut section), usually of a dark-grey or boil 
colour, heres Naemospora has no pycnidial wall, merely 
basal proliferous stratum, and is generally of a lively valiowich 
or reddish colour. There is another genus, Libertella, similar to- 
Naemospora, but having faleate and longer spores, over 10 wu. 
If one overlooks these distinctions, it is easy to go sens for the. 
tendril alone is no mark of a Cytospora or a NV. 
For example, there is a fungus recorded Wg the name. 
‘“* Naemospora crocea Pers.” as having been found on coniferous 
trunks at Alnwick, during the 1907 foray of the British Myco- 
logical Society. But, though yellow tendrils are abundant, the 
specimen on sectioning is seen to have thick dark enclosing walls. 
to all of its many chambers. It is really Cytospora Kunzei Sacc.. 
Other similar instances abound in mycological literature. 
The pycnidial chambers, or chamber, of Cytospora always 
arise in a stroma (sometimes, however, nearly obsolete), com-. 
of a more or less grumous mass of mycelial cells. 
chamber is lined on every side by a crowded stratum of spore- 
pedicels, sometimes branched, which bear the spores ste at 
2 (7819306 Wt 122—P 23 1000 2/23 
