. The British rust fungi (Uredinales), their biology and classification. Uredineae. COLEOSPORIUM 327 (2) CoLEOSPORiUM Melampyri Karst. Uredo Melampyri Rebentisch, Flor. Neomarch. p. 355. Coleosporium Mdampyri Karst. Myc. Fenn. iv. 62. Fischer, Ured. Schweiz, p. 440, f. 269. Peridermium Soraueri Kleb. Zeitschr. f. Pflanzeiikr. iv. 194. The only apparent differences from G. Euphrasiae are in the size of the spores: uredospores 24—35 X 21—28 fi; teleutospores as much as 115/a long, 21—28/x wide; epispore very thick (up to '28 fi) at the summit. iEcidia on leaves of Finus silvestris; uredo- and te
. The British rust fungi (Uredinales), their biology and classification. Uredineae. COLEOSPORIUM 327 (2) CoLEOSPORiUM Melampyri Karst. Uredo Melampyri Rebentisch, Flor. Neomarch. p. 355. Coleosporium Mdampyri Karst. Myc. Fenn. iv. 62. Fischer, Ured. Schweiz, p. 440, f. 269. Peridermium Soraueri Kleb. Zeitschr. f. Pflanzeiikr. iv. 194. The only apparent differences from G. Euphrasiae are in the size of the spores: uredospores 24—35 X 21—28 fi; teleutospores as much as 115/a long, 21—28/x wide; epispore very thick (up to '28 fi) at the summit. iEcidia on leaves of Finus silvestris; uredo- and teleutospores on Melannpy- ram arvense, M. prutense and its var. montanurn, July—September, not uncommon. (Fig. 245.) Wagner records the fecidium also on P. montaim. 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 secidium, but as this is, at any rate, not commonly found, the tecidiospores 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 more abundant than is thought to be the case. They should be searched for in ]\Iay 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 secidium {Peridermium Soraueri) in the following sj) Fig. 245. C. Melampyri. a, teleutospore on M. prntense, Randan Woo
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