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Summary: features include small thread-like fruitbody with slender head that is whitish then pink, and stem that is whitish then dingy, arising from sclerotium that is pinkish orange then tawny to reddish brown or dark brown, growth on dead culms and leaves of cereals and grasses and other herbaceous stems and leaves, and microscopic characters; causes the disease variously called speckled snow mold, gray snow mold, snow scald, or Typhula blight (also caused by T. idahoensis and T. ishikariensis), which can attack cereals and grasses; the name speckled snow mold comes from the appearance when snow is melting: patches of "mold" (mycelium) speckled with sclerotia; one of the attached photographs shows damage caused by both Typhula incarnata and T. ishikariensis after snowmelt on Agrostis palustris (creeping bentgrass); T. incarnata also found causing a root and crown rot of wheat and barley in the absence of snow cover; at least in BC (in Redhead), WA (Bruehl), ID, NY, Japan, (Remsberg), also elsewhere in North America, Europe, Asia, (Corner), Norway (Bruehl(2))
Fruiting body: 0.34-3cm high, single or in small groups from the sclerotium, simple, rarely with a branch; head 0.1-2cm x 0.04-0.2cm, thread-like, cylindric, elliptic-oblong when short, becoming hollow, acute then blunt; whitish then flesh color or rose-pink, (Corner),
Stem: 0.5-2.0 x 0.05-0.1cm, translucent white or whitish cream, then grayish or dingy brownish; puberulous [downy]; sclerotium 0.05-0.45 x 0.05-0.2cm, erumpent from substrate, nearly spherical, more or less flattened, smooth, drying or aging rough, sometimes irregular, pinkish orange when mature, then tawny to reddish brown or dark brown, (Corner), sclerotia 0.1-0.3cm in diameter when formed below soil among leaf sheaths or on roots, usually half that size or less when formed on leaf blades on the soil surface, (Bruehl(1))
Odor: indistinct (Buczacki)
Taste: indistinct (Buczacki)
Microscopic: spores 7.5-10.5 x 4.5-5.5 microns according to Donk, (but including other authors, limits extend to 4-15 x 2-8 microns), elliptic or ovoid, smooth, white; basidia 4-spored, 20-28 x 5-6 microns according to Donk, (but including other authors, limits extend to 15-40 x 3-8 microns); hyphae 3.5-6 microns wide, thin-walled, with clamp connections, "with a few gloeocystidium-like hyphae, more or less agglutinated throughout the hymenium", "incrusted with crystals in the subhymenium and sparsely on the stem"; medulla of sclerotia "wholly agglutinated, often filamentous in center, hollow in large sclerotia", cuticle 8 microns thick, golden to reddish brown, (Corner); spores 7.4-9.6 x 2.6-3.6 microns, (Bruehl(1), who says these measurements are smaller than for other workers), spores 8-11 x 4-4.5 microns, elliptic, smooth, weakly amyloid; hyphal system monomitic, (Buczacki)
Habitat / Range
on dead culms and leaves of cereals and grasses, and on herbaceous stems and leaves, often parasitic on cereals: sclerotia in spring, fruitbodies in fall, (Corner), rarely attacks species other than winter cereals and grasses, but can attack roots and basal crown tissues even in the absence of conditions required for typical snow mold development (prolonged snow cover), (Bruehl(1))
Typhula phacorrhiza does not have a distinct head, and is yellowish in color; Typhula idahoensis and T. ishikariensis have different color of fruitbody and sclerotium; none of these species are characterized by the occasional digital or radiate cells in the rind of the sclerotium that are found in T. incarnata if several fragments are examined
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. 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:
2021-02-26 11:36:23 PM
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