56 FUNGOID PESTS OF CULTIVATED PLANTS. 



short deciduous pedicel at the hase. The teleutospores differ from those 

 of Puccmia in being one-celled. The colour is also brown. 



The uredospores are supposed to be unknown, although the pustules 

 of the teleutospores are said to be sometimes intermixed with the cluster- 

 cups. Never having seen them in this connection, we cannot vouch for 

 the authenticity of the assertion. 



This endophyte has been recorded, not only in Britain, but also in 

 France. Germany, Austria. Italy, and Asiatic Siberia. 



Sacc. Syll. vii. 2007 ; Cooke M.F. 227. 



Pkimrose White Mould. 

 Ovularia i?iterstitialis (Cooke), PI. VI. fig. 67. 



Under the name of Peronospora interstitialis this mould was first 

 made known by Berkeley in 1H75 from specimens obtained from Scotland, 

 but at the time he seems to have had a suspicion that it was not a true 

 Perono&pora, since confirmed. It was afterwards quoted as Bamularia 

 interstitialis ; but that even is scarcely tenable, and we substitute the 

 above. 



It occurs in yellowish patches on the under side of the leaves, in the 

 spaces between the veins, rarely occupying any extended surface. The 

 i breads are short and fiexuous, apparently unbranched, with a few pro- 

 jecting spicules in the upper portion to support the conidia, which are 

 elliptical and either apical or lateral (which Berkeley calls " oblique "), 

 but there is no evidence of septum (15-17i x G-7/x). 



We believe it to be the same species as Ovularia primulana (Karst) 

 found in Finland, also on the leaves of Primula vera (Sacc. Syll. iv. 



787). 



This is the kind of parasite which is likely to be amenable to the 

 influence of fungicides, and has none of the pertinacity, or the resting 

 spores, of the rot-moulds. 



Sacc. Syll. vii. 867 ; Berk. Ann. Nat. Hist. 1875, No. 1455 ; Gard. 

 Chron. May 1, 188G, fig. 124; Grevillca, iii. 183. 



Pkimrose White Mould. 



I ; i i miliaria Primula (Thiini.), PI. IV. fig. G8. 



Tin | k 1 1 in this disease are circular or somewhat angular, and of a pale 

 ochraceous colour, without a definite margin, upon which the mould is 



bed in tufts on either surface. The threads are rather long (50 -GO x 5/i), 

 without septa or divisions, but very rarely at all branched. The conidia 

 are cylindricallj fusiform (20-80 x 3-6/;) and sometimes uniseptate, or 

 with one nan ver e division, and uncoloured. Our own measurements 

 are somewhal differenl (26 / ;">/<)• 



Would be iibmiasive bo spraying with dilute Bordeaux mixture. 



Tbi mould has been recorded in Italy, Austria, and Siberia, as well 

 as in Britain. 



Sacc. Syll. iv. lOK); Sacc. /•'. Ttal. t. 985. 



A black mould (< ora Primula) seated on whitish-grey spots of 



the Leaves of Primula elatior has occurred in France. The tufted threads 



