PERISPORIACEI. 



645 



Epiphyllous, or cauline, with or without a yellow spot, at first covered by 

 the epidermis, when mature very black, and regular, circular, from one to 

 two lines in breadth, slightly convex, bursting at first in the centre, and ex- 

 posing the perithecia. 



(Fig. 311 — a, nal. size ; h, portion of tuft enlarged; c, perithecia magni- 

 fied.) 



Lasiobotrys lixxe^, BerJc, is Yenturia Dickicei. 



Gen. 277. 



SPK^ROTHECA, Lev. 



^i* )^ 



Mycelium arachnoid; perithe- 

 cia globose, containing a single 

 globose sporangium ; append- 

 ages numerous, floccose, — Berk. 

 Outl.pAO^. (Fig. 312.) 



1910. 



Sphaerotheca pannosa. 

 Lev. " Kose Bliofht." 



Mycelium thickened, woolly, 

 Fig. 312. felted, persistent ; conceptacles 



minute, globose, scattered; appendages floccose, white; sporan- 

 gium many-spored. — Lev. Ann. Sc. Nat. 1851, xy. p. 138, t. 6,f. 

 6. Cooke Micr. F. t. xi./. 217, 218. Cooke exs. no. 90. Eng. Fl. 

 Y. p. 325. Fckl.exs.no. 726. Erysiphe pannosa. Tul. Carp.i.p, 

 208, t. 3. Berk. exs. no. 96. Eurotium rosanim. Grev. 1. 164,/. 2. 

 Baxt. exs. no. 92. Fr. S.M. \]i.p. 232. 



On the branches, calyces, petioles, and leayes of roses. Com- 

 mon. 

 The conidiophorous condition is Oidium leu^oconium. — Desmz. 



1911. 



Sphaerotheca Castagnai. Lev. " Hop Blight." 



On both surfaces ; mycelium effuse, web-like, commonly eyan- 

 escent ; conceptacles minute, scattered, globose ; appendages 

 numerous, short, flexuose aboye ; sjjorangium many-spored. — 

 Lev. Ann.Sc. Nat. 1851, xy.79. 139, t. 6,/. 9, 10. Cooke JI.F. t. xi. 

 /. 216. Cooke exs. no. 91. Fckl. exs. no. 711-720. E. Dipsacearum, 

 Tul. Carp. \.p. 210, t. 4,/. 4-9. E. macularis, Eng. Fl. \.p. 325. 

 Ayres. exs. no. 22. 



On leayes of hop, meadowsweet, and other plants. 



(i^t'^. 312, conceptacleraagnifieJ..) 



