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Summary: Ciborinia whetzelii produces brown cup-shaped stemmed fruitbodies arising in the spring from overwintering black sclerotia that develop on browned aspen leaves giving an "inkspot" appearance and later fall to the duff leaving "shotholes" in the leaves. It is common throughout BC (Allen), and found throughout Canada and the northern United States, but the sexual state has not yet been documented in BC, (Callan). It occurs specifically in PQ and NY, (Seaver).
Upper surface: 0.2-1cm, at first cup-shaped, expanding and becoming subdiscoid [nearly disc-shaped]; brownish; sclerotia form on living leaves, circular or irregularly subcircular in form, persistent or dehiscent, (Seaver), sclerotia form dark "inkspots" on living leave
Underside: brownish (Seaver)
Stem: 0.5-2.5cm long (Seaver, Callan)
Microscopic: spores 11-16 x 4-7 microns, elliptic, uniseriate; asci reaching a length or 150-200 microns and width of 9-12 microns, (Seaver), spores 7-10 x 3-4 microns, oval, single-celled, colorless; asci 8-spored, 160-180 x 11-12 microns, club-shaped, with a small apical plug that stains blue in Melzer's reagent; sclerotia have a distinctive palisade layer of cells just under the outer surface, (Callan), paraphyses numerous (Funk)
Habitat / Range
fruitbodies on sclerotia lying on ground that have dehisced from the leaves of Populus tremuloides, (Seaver), sclerotia on aspen and cottonwood leaves, (Allen), on aspen, rarely on balsam poplar, (Callan)
Ciborinia seaveri Groves and Bowerman, common in Alberta and eastern Canada but not reported in BC, produces similar symptoms in leaves, but the sclerotia are smaller, averaging 0.3-0.5cm across, and occur mainly on veins and petioles rather than leaf blades, (Callan).
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2017. E-Flora BC:
Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for
Advanced Spatial Analysis, Department of Geography, University of British
Columbia, Vancouver. [Accessed:
26/05/2019 12:58:04 PM
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