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Summary: features include bright orange to bright yellow cap that is club-shaped, pear-shaped, lobed, or brain-like, whitish stem, growth in shallow water on decaying plant debris, and slender cylindric to clavate but not filiform ascospores; the most common and widely distributed Mitrula species in North America; found BC, WA, OR, ID, also ON, PQ, NS, AL, CT, DC, GA, MA, MD, ME, MI, MT, NC, NH, NJ, NY, OH, PA, RI, TN, VA, VT, WV
Fruiting body: 2-10cm high, cap 0.15-1.5cm wide, round to cylindrical, cerebriform [brain-like], club-shaped, pear-shaped or lobed; bright orange to bright yellow, becoming ochraceous orange when old or pinkish when submerged in acidic water, smooth to wrinkled, slightl
Stem: 0.15-0.3cm wide in upper part, slightly enlarged in upper or lower part, unbranched; white to faintly pinkish; bald and slightly lubricous in upper part, moderately covered with matted hyphal hairs in lower part, (Redhead), 2-4cm x 0.15-0.3cm, enlarging slightly downward; whitish to pale translucent gray, sometimes tinted pink; smooth, shiny, (Bessette)
Microscopic: spores 11-17.5 x (1.5)2-2.5(3) microns, flexible, narrowly cylindric or clavate, occasionally fusoid-cylindric, one-celled or two-celled, lacking a gelatinous sheath; asci 8-spored, 115-123 x 5-7.5 microns, elongate-clavate, apical pores amyloid, croziers present; paraphyses 120-130 x 1.5-3 microns, filiform, slightly enlarged in upper part, (Redhead), spores 11-18 x 1.5-3 microns, narrowly elliptic to cylindric or slightly club-shaped, single-celled or two-celled with a septum, smooth, colorless, (Bessette)
Habitat / Range
gregarious, single to cespitose, in shallow water, on decaying wet needles, scales, twigs, leaves, or fruits of Acer saccharinum, Alnus rubra, A. rugosa, Fagus grandifolia, Liquidambar styraciflua, Lysichitum americanum, Osmunda cinnamomea, Pinus monticola, P. strobus, Quercus borealis, Q. prinus, Thuja occidentalis, T. plicata, mats of Calliergonella cuspidatum and Sphagnum recurvum, and logs, mud, algal mats, or other unidentified vegetation, April to September, (Redhead), scattered or in groups in shallow water on decaying leaves, needles, twigs, and debris in woodlands and bogs, April-August, (Bessette for northeastern North America)
Mitrula borealis has been recorded much less often, and is reliably differentiated by spores; Mitrula lunulatospora of eastern North America is distinguished by spores 11-19 x (2)2.5-3.5(4) that are lunate to cymbiform [boat-shaped] and inflexible; Mitrula paludosa of Europe, has spores are slightly broader 11-19(24) x (2)2.5-3.5(4) microns; Vibrissea truncorum somewhat similar but prefers to fruit in running water and is usually submerged, the head usually orangish to pinkish orange and rounder and more regularly shaped
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:
2020-08-07 11:46:56 AM
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