326 COLEOSPORIUM 



Batheaston (C. \i. I>ni<»me), Oxford Botanic (J aniens (Herb. 

 Bloxam). October. This is, of course, an introduced species. 



Distribution : Europe. 



6. Coleosporium Rhinanthacearum LeV. 



Coleosporium Khincmthacearum LeV. Ann. Sci. Nat. 1847, p. 373. 

 Cooke, Eandb. p. 521; Micr. Fung. p. 218, pi. 8, f. 17'".. 177. 

 C. Euphrasiae Plowr. CTred. p. 252 S:\n-. Syll. vii. 754. 



This species is now divided into two, but on purely bio- 

 logical grounds : no morphological distinctions worthy of the 

 name can be discerned, and since the hosts are all closely allied 

 it is perhaps best to retain the collective name ; at any rate for 

 a time. 



(1) Coleosporium Euphrasia: Wint. 



Credo Euphrasiae Solium. PI. Sail. ii. 230. 



Coleosporium EuphrasiaeWinter, Pilze, p. 246. Fischer, Ured. Schweiz, 



p. 442. 

 Peridermium Stahlii, Kleb. Zeitschr. f. Pflanzenkr; ii. 269, pi. 5, f. 5. 



S 1 ic r liiononcs ) 

 ' ' y Like those of the allied species. zEcidio- 



spores oval or roundish, 20—30 x 15 — 24 p. 



Uredospores. Sori small, scattered, roundish, flat, } T ellowish- 

 red ; spores irregularly polygonal, densely verruculose, 20 — 24 

 x 14 — 17 fju] epispore thin, colourless. 



Teleutospores. Sori small, flat, roundish, red; spores pris- 

 matic, orange, up to 105 /u. long, 18 — 24^ wide; epispore at 

 summit about 14 p thick. 



xtEcidia on leaves of Pinus silvestris; uredo- and teleutospores 

 on Euphrasia officinalis, Bartsia Odontites, Rhinanihus Grista- 

 galli, July — September, very common. 



It is not certain that Bartsia can be infected from Euphrasia or 

 Rhinanthus ; no experiments on that point are recorded. Klebahn proved 

 abundantly that the parasite can be transferred from Rhinanthus to 

 Euphrasia, but not to Senecio, Sonckus, or Tussilago. Wagner 'Zeitschr. 

 f. Pflanzenkr. viii. 261) infected Euphrasia with secidiospores from Pinus 

 montana. 



