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Species Information
Summary: Key diagnostic features are the brownish to amber colored, cushion-shaped fruitbodies, erumpent whitish conidial stage, large granular conidia, and growth on Populus. It may cause serious canker formation in native and exotic poplars, especially hybrids and young nursery stock. Cankered areas "first appear slightly more sunken than surrounding tissue, and bark may be discolored orange", acervuli then develop "in concentric waves around the points of inoculation, usually around a lenticel", (Callan). Some authorities regard this as a Pezicula species: Seaver transferred it to Pezicula, and according to Dictionary of the Fungi 10th Edition, molecular data do not support separation of Neofabraea from Pezicula.
At the time of Seaver''s description, it was known only from the type locality in ON (Seaver), but it is now known more widely, including BC, Europe, and Japan (Callan).
Upper surface: apothecia (fruitbody) 0.05-0.2cm across, disc-shaped to cushion-shaped, fleshy; pale brown to amber; acervuli 0.05-0.15cm across and up to 0.005cm thick, "they first appear as pimple-like protrusions before they rupture the epidermis to expose their whitish to yellowish surface", (Callan), scarcely exceeding 0.05cm across, erumpent [emerging from the bark] but scarcely rising above the surface, surrounded with the upturned edges of the ruptured outer bark; dark brownish black; spore-bearing surface concave or nearly flat, reddish brown with a slightly elevated darker center that gives the spore-bearing surface an umbilicate appearance, (Seaver)
Stem: without stem (Seaver)
Microscopic: spores 16-22 x 5-6 microns, oblong-elliptic, straight or slightly curved, or unilaterally flattened, up to 3-septate, colorless; asci 8-spored, 80-112 x 9-12 microns, cylindric to clavate, short-stemmed; conidia 25-45 x 4-5 microns, cylindric to spindle-shaped, nonseptate, colorless, often with granular cytoplasm; acervuli are covered by colorless, septate, simple or branched conidiophores measuring 25-35 x 4 microns, (Callan), spores 18-20 x 5-6 microns, elliptic, becoming indistinctly 3-septate, usually with 2 oil droplets, 2-seriate in upper part; asci apparently normally 8-spored but with only 5 or 6 of the 8 developed, reaching a length of 80 microns and a width of 12 microns, clavate; paraphyses enlarged in upper part, colorless, (Seaver)
Habitat / Range
thickly gregarious, usually occurring singly, or rarely two or three crowded together, (Seaver), mature fruitbodies are produced in June, usually erumpent [emerging] first near the center of the cankered area on P. tremuloides, P. trichocarpa, and its hybrids, (Callan for BC, but notes that it occurs on other Populus species elsewhere)
