Supplementary Notes on the Erysiphaceae 
By ERNEsT S. SALMON, F.L.S. 
(Continued from page 22) 
PoDOSPHAERA OXYACANTHAE (DC.) de Bary. (Monograph, p. 29) 
Syn. add: P. clandestina Lévy. var. ramulicola Thiim. Bull. 
Soc. Imp. Nat. Mosc. Sy. 1207 Sse, 
Exsicc.* add: Shear, New York Fungi, 138 (in herb. Jaczew- 
ski), 
Distrib. add: Asia; Siberia (Minussinsk). 
ffosts, add: Crataegus nigra (40), C. sanguinea, C. tanacett- 
Solius (80), Prunus Persica (2*) (40*), Vaccinium Vitis-Idaca. 
Professor N. Martianoff has kindly sent me a specimen of the 
Podosphaera on which Thiimen founded his ‘“P. clandesina 
var. ramulicola.” Thiimen gave the following diagnosis: “ Peri- 
theciis dense ageregatis, numerosissimis, pulviniformibus ; mycelio 
Candido, non evanido ; ascis sporisque typicis. In ramulis vivis 
3 Crataegi sanguineae Pall. in sylvis prope Minussinsk.” The speci- 
men is remarkable for the manner in which the perithecia are 
densely compacted in extended patches along the branch of the 
Crataegus. Due probably to this dense crowding, causing lateral 
Pressure, some of the perithecia are oblong-pyriform in shape. The 
Structure of the perithecium, the asci and spores are normal for the 
Species. The perithecia are not fully mature, but the apices of the 
appendages show the beginning of the characteristic branching of 
P. oxyacanthae. On the whole, I consider that Thiimen’s plant, 
being characterized merely by the crowded habit of the perithecia 
'S to be regarded as only a form, and not as a true variety, of P. 
°tyacanthae, 
je es of P. oxyacanthae with quite the same habit as that 
E © “Var. ramulicola”” are seen in the specimen in Ellis and 
verhart’s N. Amer. Fungi, no. 2335, ‘‘on leaves of Crataegus, 
ees those exsiccati are quoted which have been personally examined, and unless 
an asterisk, or followed by information as to the source, all the numbers 
be = ae Copies in the Kew Herbarium. Those distinguished by an asterisk are to 
in the herbarium of the British Museum (Natural History), London. 
