Stereum ochraceoflavum (Schwein.) Peck
no common name
Stereaceae
Species account author: Ian Gibson.
Extracted from Matchmaker: Mushrooms of the Pacific Northwest.
Introduction to the Macrofungi
no common name
Stereaceae
Species account author: Ian Gibson.
Extracted from Matchmaker: Mushrooms of the Pacific Northwest.
Introduction to the Macrofungi
Photograph
Species Information
Summary:
{See also Stereum Table.} Features include 1) growth on hardwoods, often growing together to form a row or rows on twigs and small branches, when young sometimes suspended from the midpoint of a circular cap surface, also resupinate on undersides of the wood, 2) a small, somewhat tough, but relatively thin and pliant fruitbody, the upper side finely hairy-tomentose with hairs pointing toward the margin, indistinctly zoned, whitish or grayish to ocher, with a fringed margin, 3) a spore-bearing surface that is ocherish, smooth, and undulating-tuberculate, 4) spores that are cylindric to elliptic, smooth, amyloid, and colorless, 5) acute tipped hyphidia and also pseudocystidia (but not pseudoacanthohyphidia or conducting hyphae), 6) hyphae of 2 types: a) thin-walled to thick-walled, septa without clamp connections, and b) thick-walled. |Stereum complicatum, Stereum gausapatum, Stereum hirsutum, and Stereum ochraceoflavum are members of the subgenus Stereum, having sharp tipped hyphidia but lacking the pseudoacanthohyphidia found in subgenus Aculeatostereum. |In Stereum ochraceoflavum, the well defined cutis present in most Stereum species is lacking, and the tomentum is derived directly from the pale colored context. (This well defined cutis layer is lacking also in Stereum striatum [found in eastern North America and growing on Carpinus or rarely Nyssa], but the tomentum is more or less appressed in that species, giving a cap surface that appears lineate-striate, shining, and silky). (Chamuris).
Microscopic:
SPORES 7-9 x 2-3 microns, cylindric to elliptic, smooth, amyloid, colorless; BASIDIA 4-spored, 30-37 x 6-7 microns, narrowly clavate, without basal clamp connection; PSEUDOCYSTIDIA 80-110 x 5-7 microns, thick-walled, emerging from the skeletal hyphae, without contents; CYSTIDIOLES 30-35 x 3-4.5 microns [by illustration acute-tipped hyphidia]; HYPHAE dimitic, generative hyphae 2-4.5 microns wide, thin-walled to thick-walled, septa without clamp connections, skeletal hyphae 5-7 microns wide, thick-walled, (Breitenbach), SPORES 5.5-9 x 1.5-2.5 microns, cylindric; BASIDIA about 27 x 4.5-5 microns, generative HYPHAE 1.5-4 microns wide, skeletal hyphae 4-7 microns wide, (Julich)
Notes:
Stereum ochraceoflavum has been found in BC, WA, NF, NS, ON, AL, AR, AZ, CA, CO, CT, DE, FL, GA, IA, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, NC, NH, NJ, NY, OH, PA, SC, TN, TX, VA, VT, and WI, (Ginns). It has also been found in Europe including Switzerland, Africa, and Asia, (Breitenbach).
Habitat and Range
SIMILAR SPECIES
Stereum hirsutum always has a bright ocher-orange spore-bearing surface when fresh and substantially thicker fruitbodies; S. ochraceoflavum favors twigs and prunings, while S. hirsutum is also found on trunks, in crevices, and on thick branches, (Breitenbach). S. ochraceoflavum is distinguished from the S. hirsutum group by its duller, paler color and thinner, more pliant cap with long white hairs pointing toward the margin, plus the absence of a red-brown cap cuticle, (Arora). |The Stereum hirsutum complex and S. gausapatum have a compact brown cutis about 50 microns thick underlying the tomentum (that is some shade of brown, yellow - gray when old), whereas S. ochraceoflavum lacks the brown cutis and tomentum is whitish, (Chamuris). |Stereum striatum (Fr.) Fr., also lacks a brown cutis layer, but has a tomentum of short appressed hairs (rather than erect hairs), making the cap surface lineate-striate, shining, and silky rather than soft, strigose-hirsute or hispid. S. striatum is restricted to Carpinus (hornbeam), rarely Nyssa (tupelo) whereas S. ochraceoflavum is not known on these substrates. (Chamuris). S. striatum (Fr.) Fr. is known from eastern North America as far west as Texas and reports exist for other hardwood species (Alnus, Betula, Ilex, Liquidambar, Ostrya, Prunus, Quercus, Rhus) according to Ginns(5), but S. ochraceoflavum has been regarded in the past as a variety of S. striatum.Habitat
on dead branches and twigs of hardwoods, especially Quercus (oak), still with bark, occasionally massively covering branches lying on the ground; throughout the year, (Breitenbach) on a variety of hardwoods, reported on Picea engelmannii (Engelmann Spruce) and isolated from decay in utility poles of Pseudotsuga menziesii (Douglas-fir), associated with a white rot, (Ginns)
Status Information
Synonyms
Synonyms and Alternate Names:
Grandinia raduloides (P. Karst.) Bourdot & Galzin
Hydnum raduloides P. Karst.