18 
Stromata often crowded, lenticular or conical, up to 1 mm, 
broad, blackish, immersed, then erumpent (on the larger branches 
most. often transversely), multilocular; loculi (when perfect) 
narrow, radiating, walls of brown prosenchymatous cells, no 
columella : disc emerging, flat, snow-white, pierced by one or 
two black ostioles, Spores 5-6 x «1 py, issuing in reddish tendrils ; 
sporophores filiform, usually simple, rarely branched, 12-20 
b. 
On bark of Prunus Cerasus, P. domestica, P. insititia, P. Padus, 
parasite. Autumn and winter. The pyenidial stage of Valsa 
leucostoma Fr., which often accompanies it. 
In good specimens the round white disc, marked in the centre 
with a black “ eye,” is very conspicuous. The spore-mass, when 
seen in water under the microscope, is distinctly pinkish-red ; 
the fresh tendrils are of the colour called by artists “ light-red ”’ 
not the deep purplish-red of those of C’, rubescens and C. Prunorum. 
As the Cytospora-stage changes into the Valsa, the one or two 
ostioles increase to several less prominent ones. C. cincta, also 
on species of Prunus, resembles this species, but has aay 
fewer loculi and a dingy-whitish dise 
C. leucostoma is stated (Rep. Soath’Atr, Assoc. Ady. Sei! 
1915, p. 545) to cause the disease called the ‘‘ Die-back”’ of 
Apple trees, but probably this is a mistake of identification. 
Cf. C. rubescens ul. and Valsa Mali Miy. & Yan 
Distrib. Europe and Siberia 
Stevens (Illin, Agric. Expt. Sta. Bull. no. 217) found a Cyto- 
spora causing a canker on twig of Apple, which he was inclined 
to put under C. leucostoma, but he did not arrive at a definite 
conclusion. He found that he could transfer it readily, in 
pure cultures, from Apple to Pear, Rose, Plum, Peach and Rubus, 
on all of which it grew freely (but not on Cherry or Acer). On 
Rubus the ’ Pychidia were smaller. 
C. Lonicerae, sp. n. Stromata subsparsa, 200-300  diam., 
rotundata, nigrescentia, immersa, sepe halone brunneo-rubro 
cincta, tandem poro atro tantum emergentia (disco obsoleto), 
intus subunilocularia, vel e loculis paucis rotundis crasse contextis 
composita ; " sporule hyaline, 5-6 x 1 yp, allantoidee, pReee 
phoris subulatis subsimplicibus 12-15 x 1 pw suffulte 
Hab. in ramulis Lonicerae, Cheshire (Ellis), Maio. 
Distinguished from the spermogonial stage of Valsa olivacea 
Fckl. (Symb. Myc. Nachtr. i. 27) by the minute pycnidia and 
the much smaller spores. 
C. microspora Rabenh. Deutsch. Kr. F. p. 147. Sace. Syll. iii 
253. Allesch. vi. 578. Died. p. 340. Na aemospora microspore 
Cord. Ic. iii. 26, f. 69, p.p. 
* Stromata gregarious, raising the epidermis conically ; then 
bursting it by the protruding black disc ; ‘texture dark, fuliginous, 
