80 The Scotish Naturalist. 



3. P. densa Rabh. 7. Rather plentiful beside the Dee at Cults, 



in August, on Bhinanthus Crista-galli, not previously- 

 recorded as Scotch. 

 Sect. II, Bremia Regel. Basidia repeatedly bifurcated, bearing 

 at the ends of the branches flattened disks, from which 

 arise from 3 to 5 branchlets, each of which bears a coni- 

 dium. The latter has a low papilla at the tip ; and in 

 germination a tube emerges from the papilla. Oospores 

 round, small, with thin cell-wall. 



4. P. Lactucae Regel ( = P. gangliformis Berk, No. 1445, in 



Mycol. Scotica), 5, 7, 8. Common, probably in many 

 places, on 



Senecio vulgaris and S. Jacoboea. 



Cnicus lanceolatus and C. arvensis* 



Taraxacum officinale. 



Sonchus oleraceus and S. arvensis. 

 Sect. III. Eu-PeroilOSpora. Basidia repeatedly bifurcated, 

 ending in slender curved branchlets, bearing terminal 

 conidia, which have not an apical papilla. In germina- 

 tion, a mycelium tube protrudes from the side of the 

 conidium. 



Sub-sect. a. CalothecSB. Oospores covered with warts or 

 netted ridges. 



5. P. calotheca De Bary. 5, 7, 8. Not uncommon on 



Galium boreale, beside the Dee near Cults in August 

 G. Aparine, near Aberdeen. 

 Asperula odorata, Glamis (J. S.). 



6. P. Myosotidis De Bary. 7. (Scot. Nat, 1886, p. 228.) 



Myosotis arvensis. In May, near Aberdeen, once. 



7. P. ViciaB (Berk.) De Bary. 5, 7, 8. Common in autumn on 



Vicia Cracca, Speyside (Rev. Dr. Keith). 

 V. sepium, near Dunottar. 

 V. sativa, near Aberdeen. 

 Lathyrus macrorhizus, near Aberdeen. 

 " On leaves of pea," in Tay. 



8. P. Alsinearum Caspary (Scot Nat, 1883, p. 35). 7, 8. 



Will be found probably in most localities, if looked for ; on 

 Cerastium triviale, near Aberdeen. 

 Stellaria media. Common. In August, the oospores were 



found plentifully in all parts of deformed flowers near 



