19 
‘within olive-brown, in the upper part in young pustules almost 
orange-red; loculi incomplete, circinating round a. central 
columella, with a common opening... Spores 6-8. x L.p; sporo- 
phores rod- -shaped, 10-20 x 14 pw.” (Died.) 
On Crataegus and Pyrus "Malus, Cheshire (Ellis), _ Spores 
OX La issuing in a white tendril. Spring. 
This species is recorded on Sorbus Aucuparia, 8S. domestica, 
and other hosts on the Continent, as well as on those named 
above. Cooke issued specimens which he named C. microspora 
Cord. var. Amelanchieris (on Amelanchier, Kew Gardens), but 
he afterwards transferred them (Grevill. xiii. 96) to C'. microstoma 
Sacc. Probably the second name was a slip of the pen. There 
has been great confusion between C. microspora and Naemospora 
microspora, and, as is shown below, C. microspora (Corda) Rabenh. 
should probably be suppressed, and the species arranged under 
other heads. On account of this, I have preferred to reproduce 
above merely Diedicke’s description. 
C. microstoma Sacc. Syll. iii. 254, Allesch. vi. 593. Died. 
. 355. 
Stromata convex, more rarely conical, with a roundish-oval 
base, usually 500-650 » diam., multilocular within, the loculi 
arranged round the circumference; walls of pycnidial chambers. 
olivaceous-yellow when young; the dingy disc furnished with a 
single pore (or rarely several). Spores proportionately rather 
thick, 5-6 x 1-5 »; spore-mass nearly colourless; sporophores 
rather thick, branched, about 28 » long. 
On branches of Prunus Laurocerasus, P. spinosa and other 
species of Prunus. Not uncommon, The pyenidial stage of 
alsa microstoma Nits 
A variety Colinisielty (oF see Jenga) 3 is assigned to 
this species in Grevill. xiii. 95, and Sacc. Syll. x. 244. It ha 
the pycnidial walls thick, of par parenchymatous cells. 
Mstrib. France, Germany, Italy, Sweden, Russia 
C. nivea Sacc. Syll. iii. 260. Allesch. vi. 590. Died. p. 354. 
Sphaeria nivea Hoffm. Veg. Crypt, i. 28 p.p. Non C. nivea Fekl. 
Stromata gregarious, 500-750 uw diam., between conical and 
discoid, immersed, then erumpent, black, dark-fuscous within, 
with numerous small loculi; walls thick and dark; disc emerging, 
roundish, snow-white, with a central black pore. Spores 6-7 
x 1-5-2 p, issuing in reddish tendrils ; sporophores 10-13 « 1-5 py. 
On bark of Populus nigra, P. tremula, etc., Kew; Hampstead ; 
Sutton Coldfield; Scarborough; Ayrshire, etc. Perhaps rather 
common, but not so abundant as C. chrysosperma. The pyenidial 
stage of Valsa nivea Fr. 
Like many species of Cytospora, this has been much confused, 
and is recorded on various trees; but it will be best to follow 
Saccardo and consider it as confined to Populus. The white 
disc, marked with a black “‘ eye’ as in C. leucostoma, is sometimes 
very conspicuous, but, as usual, when the Valsa-stage supervenes, 
the central black ostiole is replaced by a ring of perithecial mouths. 
B2 
