The Scottish Naturalist, 223 



Pycnidia, complete, globular or depressed, usually papillate, on 

 stems and branches, scarcely ever causing spots. 



Rhabdosporou 



Pycnidia globose-oblong, depressed, rather large, incomplete 



above, dehiscing as in Hysterium ; on branches and 



stems. . Phlyctaena. 



AA. Pycnidia sunk in a stroma, sporidia free from one another, 



slender, with a few rigid spreading cilia at each end. 



Dilophospora. 



XXI. Septoria Fr. 



Pycnidia as above ; sporidia usually filiform, with numerous septa 

 or guttulae, rarely without either, hyaline or yellowish ; 

 basidia small or absent. This " genus " resembles 

 Ascochyta in the spots it produces on the leaves, &c, of 

 plants ; and several of the species in the two may 

 perhaps be stages in life-histories of the same fungi, pro- 

 bably of Sph&reUa and allies among Pyrenomycetes. 



103. S. Clematidis Rob. and Desm, 2841, C.508, M.1143 



(D. & R. Stevenson). 

 On leaves of Clematis Vitalba. 

 Tay. 



104. S. Hippocastani B. & Br., 2575, C.468 (sub S. JEsculi 



Lib.) M.1132. 

 On leaves of JEsculus Hippocastdnum (Horse-chestnut). 

 Tay (Dun). 

 Cooke, in his list in Grevillea, identifies this with Ascochyta 

 JEsculi Lib., and mentions it under the name Septoria 

 JEsculi Lib. The sporidia of this fungus do not agree 

 with the description in Annals and Mag. of Nat History, 

 1850, No. 434, by Messrs. Berkeley & Broome, though 

 the difference may be due to difference of age. But the 

 name *S'. Hippocastani may stand in the meantime. 

 ^105. S. Rosae Desm. 2615 (D. & R. Trail, Sc Nat. 1885, 

 p. 40). 

 On living leaves of Rosa canina, at Banchory, in July. 

 Dee. 

 Spots brown, with a reddish border ; pycnidia numerous, but 

 free from one another, about 100 in diameter; sporidia 

 effused as a white crust on 4eaf, nliform-clavate, curved. 



