. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 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 115fi long, 21—28p wide; epispore very thick (up to 28/x) at the summit. iEcidia on leaves of Pinus silvestris
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. 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 115fi long, 21—28p 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 Fig. 245. C. Melampyri. a, teleutospore on M. pr
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