COLEOSPORIUM 



327 



(2) Coleosporium Melampyri Karst. 



Uredo Melampyri Rebentisch, Flor. Neomarch. p. 355. 



Coleosporium Melampyri Karst. Myc. Fenn. iv. 62. Fischer, Ured. 



Schweiz, p. 440, f. 269. 

 Peridermium Soraueri Kleb. Zeitschr. f. Pflanzenkr. iv. 194. 



The only apparent differences from C. Euphrasiae are in 

 the size of the spores : uredospores 

 24 — 35 x 21 — 28 //, ; teleutospores as 

 much as 115 fi long, 21 — 28 p wide; 

 epispore very thick (up to 28 /x) at the 

 summit. 



iEcidia on leaves of Pinus silvestris ; 

 uredo- and teleutospores on Melampy- 

 r a in arvense, M. pratense and its 

 var. montanum, July — September, not 

 uncommon. (Fig. 245.) 



Wagner records the secidium also on 

 P. montana. Klebahn has demonstrated that 

 the spores of this species will not infect 

 Euphrasia, Rhinanthus, or Campanula. I have 

 not seen the thickening on the summit of the 

 teleutospores so pronounced in ours as in the 

 continental specimens, possibly because they 

 were not so mature. 



Since the uredo-hostsof C. Rhinanthacearum 

 are all annual and die at the approach of winter, it would seem probable 

 that fresh infections must occur each year from the ajcidium, but as this 

 is, at any rate, not commonly found, the secidiospores must be widely 

 distributed by the wind; it is very possible, however, that the fungus 

 winters in some other manner as yet unsuspected, or that the secidia are 

 mi >re abundant than is thought to be the case. They should be searched 

 for in May and June. There is here great scope for experimental research, 

 especially since young pot-plants of Pinus can be used for infection. 

 Klebahn placed such a Pine amongst a clump of Melampyrum, strongly 

 infested with Col. Melampyri, and left it from July to September (the pot 

 sunk in the earth); in the latter month spermogones appeared and the 

 Becidium {Peridermium Soraueri) in the following spring. 



Fig. 245. C. Melampyri. 



a, teleutospore on M. 

 pratense, Randan Woods; 



b, teleutospore on the 

 same, gathered at Bonn, 

 Germany. 



Distribution : Europe. 



