. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 340 MELAMPSOKA pores; paraphyses capitate with a slender pedicel, thickened (up to 8 /li) above, 50—70 x 18—25 ix. Teleuto spores. Sori hypophyllous, covered by the epidermis, small, about \ mm. diam., but united into groups bounded by the veins, brown with a tinge of bluish-grey; spots brown on the upper surface; spores irregularly pris- matic, rounded at both ends, 25—40 X 7—13 yu.; epispore thin, clear-brown, scarcely thickened above, with a barely perceptible apical germ-pore. Cseomata on Euonymus europaeus
. The British rust fungi (Uredinales) their biology and classification. Rust fungi. 340 MELAMPSOKA pores; paraphyses capitate with a slender pedicel, thickened (up to 8 /li) above, 50—70 x 18—25 ix. Teleuto spores. Sori hypophyllous, covered by the epidermis, small, about \ mm. diam., but united into groups bounded by the veins, brown with a tinge of bluish-grey; spots brown on the upper surface; spores irregularly pris- matic, rounded at both ends, 25—40 X 7—13 yu.; epispore thin, clear-brown, scarcely thickened above, with a barely perceptible apical germ-pore. Cseomata on Euonymus europaeus, August, September, rather rare; uredo- and teleutospores on Salix aurita, S. Gaprea, S. cinerea. (Fig. 256.). Fig. 256. M. Buonymi- Caprearum. Old dead leaf of S. Gaprea, show- ing teleuto-sori on lower face (slightly reduced). Fischer records the cseoma in Switzerland in May and June. The distinction of this species from the preceding one (apart from the secidial host) lies in the teleuto-sori ; these are hypophyllous and subepidermal, while those of M. Larici-Gaprearum are epiphyllous and subcuticular. It is not certain, however, that this distinction is absolute; Fischer in a culture on S. cinerea obtained a few teleuto-sori showing also the latter characters. There is a further difference in the form of the teleutospores. 3. Melampsora Larici-epitea Kleb. (emend. Fischer). Uredo epitea K. et S. Mycol. Heft. i. 68. Lecythea epitea Uy. ; Cooke, Micr. Fung. p. 221. Melampsora epitea Thiim. ; Plowr. CJred. p. 239. M. Larici-epitea Fischer, Ured. Schweiz, p. 485, f. 313. Kleh. in Zeitschr. f. Pflanzenkr. 1899, ix. 88. Alcidiospores. Caeomata hypophyllous, scattered or in rows, with yellow spots on the upper surface, roundish or oblong, ^—1^ mm. long, pale orange-yellow; spores roundish or some- what polygonal, finely warted, 15—25x10—21/a; epispore 1^-—3/J, thick, with no recognisable germ-pores. Uredospores. Sori amphigenous, seated on yellow spots, orange-yel
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