The Scottish Naturalist 



6 9 



or elliptic brown resting spores, each about 50 to 80 in 

 diameter. 



Peronospora Valerianae sp.n. 



Effused in undefined violaceous-grey patches on the lower sur- 

 face of slightly discoloured spots on the leaves of Valeriana 

 officinalis, by the roadside at Cladich, near Loch Awe. 

 Conidiophores 5 or 6 times bifurcated, the terminal branch- 

 lets (about 7 long) spreading at right angles, or slightly 

 recurved, scarcely tapering. Conidia obovate or obovate- 

 elliptical, varying from 27 by 24 to 30 by 22 ; membrane 

 dull violet brown. Oospores not seen. This species seems 

 to approach P. violacea Berk. 



Exoascus Sadebeckii (Johans)=2£ flams Sadebeck, nee 

 Ellis. 



Gives origin to slightly depressed circular spots, from 2 to 5 

 mm. broad, on the leaves of Alnus glutinosa. The 

 lower surface (seldom the upper) of each spot is covered 

 with a yellow coat composed of the asci, each nearly 

 cylindrical, subtruncate, 35-45 by 14-15, supported on a 

 stalk-cell about 18-20 in each diameter. Ascospores usually 

 eight in each ascus, globular, about 6 in diameter. They 

 are soon replaced by an indefinite number of small 

 sporules. Common in August and September in the locali- 

 ties mentioned above, and also near Aberdeen. 

 Venturia exosporioid.es (Desm.) Sacc. 



On dead leaves of Lazula maxima, near the summit of Duni- 

 quoich, beside Inveraray. This fungus has been recorded 

 in Myc Scot. (No. 2140), under the name of V. Chae- 

 tomium De. Not. (=Sphce)ria Ckeetomium Corda), from 

 Carex pendula, found in the neighbourhood of Forres. 

 It is, however, distinct from Sphzria CluUomium Corda, 

 which lives on decaying needles of Conifers., and some- 

 times on wood of Dicotyledons, though the two are Very 

 closely allied. In my specimens the collapsed perithecia 

 measure 160 across the cup, which is very like a minute 

 Peziza ; the bristles are about 90 to 120 long, and 5 

 thick at the base ; the asci measure 45 to 55 by 5 or 6, 

 and are scarcely thickened at the apex, and the hyaline 

 sporidia measure 10-11 by 2, and show a median cross- 

 septum and 4 guttulse. 



