dcsimg

Associations

provided by BioImages, the virtual fieldguide, UK
Foodplant / parasite
hypophyllous, subepidermal telium of Melampsoridium betulinum parasitises live leaf of Betula
Other: major host/prey

Foodplant / parasite
pycnium of Melampsoridium betulinum parasitises live Larix

Foodplant / parasite
hypophyllous uredium of Melampsoridium betulinum parasitises live leaf of Alnus cordata
Remarks: season: 8-10
Other: unusual host/prey

Foodplant / parasite
hypophyllous uredium of Melampsoridium betulinum parasitises live leaf of Alnus glutinosa
Remarks: season: 8-10
Other: unusual host/prey

Foodplant / parasite
hypophyllous uredium of Melampsoridium betulinum parasitises live leaf of Alnus incana
Remarks: season: 8-10
Other: unusual host/prey

Foodplant / parasite
hypophyllous uredium of Melampsoridium betulinum parasitises live leaf of Alnus rubra
Remarks: season: 8-10
Other: unusual host/prey

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Comprehensive Description

provided by North American Flora
Melampsoridium betulae (Schum.) Arthur
Uredo populina p betulina Pers. Syn. Fung-. 219. 1801. Uredo Betulae Schum. Enuni. PI. Saell. 2 : 228. 1803. Uredo ovata Betulae Strauss, Ann. Wett. Ges. 2 : 93. 1810. Melampsora betulina Tul. Ann. Sci. Nat. IV. 2 : 97. 1854. Aecidium Laricis Kleb. Zeits. Pflanzenkr. 9 : 18. 1899. Melampsoridium betulinum Kleb. Zeits. Pflanzenkr. 9: 21. 1899. Peridermium Laricis Arth. & Kern, Bull. Torrey Club 33 : 436. 1906.
Pycnia amphigenous, rather numerous, scattered, inconspicuous, subcuticular, paleyellow, flattened conical, 50-65/^ in diameter by 20-30// high; pycniospores oval, 1.5-2/*
long, abundant.
Aecia from a limited mycelium, hypophyllous, solitary or in rows on one or both sides of the midrib, flattened laterally, or subcylindrical, 0.1-0.15 mm. wide, 0.3-1 mm. long, by 0.3-0.5 mm. high; peridium light reddish-orange fading to white, rupturing along the apical line, peridial cells rhomboidal in longitudinal section, 25-30 (i long, somewhat overlapping, inner wall finely verrucose, transversely striate, 2-3/* thick, outer of equal thickness, smooth ; aeciospores globoid or broadly ellipsoid, 12-18 by 16-25 p ; wall colorless, rather thin, 1-1.5/*, closely and evenly verrucose, except a small area on one side which is smooth and slightly thinner.
On Pinaceae :
Larix sp. Not yet found in America.
Uredinia hypophyllous, scattered, small, round, less than 0.5 mm. across, reddishyellow, at last somewhat pulverulent ; peridium hemispherical, firm, dehiscent by a small central orifice, cells polygonal, with outer wall thin, 1-3^, inner wall thick, 6-8 /z, extended at the orifice into long points ; urediniospores elongate-elliptical or obovate, sometimes clavate, 8-14 by 22-38/^; wall colorless, thin, less than 1m thick, strongly and sparsely echinulate, except apex, which is smooth ; paraphyses rudimentary, thinwalled, fusiform,
7-11 by 25-35 fi.
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bibliographic citation
Joseph Charles Arthur. 1907. UREDINALES; COLEOSPORIACEAE, UREDINACEAE, AECIDIACEAE (pars). North American flora. vol 7(2). New York Botanical Garden, New York, NY
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