Amanita sp-N58 - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella
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name Amanita sp-N58
name status cryptonomen temporarium
author Tulloss & Rodríquez-Caycedo
english name "Brown-orange Ringed Ringless Amanita"
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  • 1. Amanita sp-N58, Devil's Hopyard St. Pk., East Haddam, Middlesex Co., Connecticut, U.S.A.  (RET 490-6)

    • intro This species was first seen by us during the COMA (Connecticut-Westchester Mycological Association) annual Clark Rogerson Foray on Labor Day weekend in September, 2011.
    cap The cap of A. sp-N58 is 27 - 56 mm wide, brownish orange to orange-brown, and plano-convex.  Its flesh is white or whitish and doesn't change when cut or bruised.  The cap's margin is striate for about one-sixth to one-third of the cap's radius.  The pallid grayish to grayish volva remnants on the cap takes on the form of felted-pulverulent patches or warts and are up to about 1 mm thick.  When the volva takes the form of warts, they have a flattened or irregular upper surface—they are not pyramidal—and have polygonal bases.
    gills The gills are free, sordid cream in mass, pale creamy white in side view, with edges bearing little decoration.  The short gills are sharply cut-off on, plentiful, of many different lengths, and unevenly distributed among the full length gills.
    stem The white stem of the present species is 50 - 100 × 3 - 8.5 mm and bears raised fibrils that become orange-brown from handling.  Below the region of fibrils, the stem is chalky and will retain finger prints.  The stem's bulb measures 5.5 - 13.5± mm × 6.5 - 15± mm.  The stem's flesh is off-white.  In the material seen, the stem was stuffed in its upper part and hollow below.  The stem has a ring attached 10 - 24 mm below the stem's top; the ring is membranous, faintly orangish white, narrow, and has a thickened grayish edge.  The ring may soon collapse on to the stem and become reduced to a grayish or nearly black line.  The pallid to gray to dark gray volva often has three parts.  It appears on the lower stem in small patches and also, on the top of the bulb as a raised rim such as is seen in A. pantherina and as a membranous flap, such as is typical of the gemmata-like species in Amanita sect. Amanita.
    odor/taste Odor and taste of this mushroom have not been recorded.
    spores The spores of this species measure (8.5-) 9.0 - 12.2 (-15.0) × (5.5-) 5.9 - 7.2 (-8.8) μm and are ellipsoid to elongate and inamyloid.  Clamps are probably lacking at bases of basidia.
    discussion The similar size and shape of the narrow spores, the orange tint in the cap, the similarity in the initial characters of the fragmentary nrLSU sequences obtained from the two taxa, etc. suggest that A. sp-N58 is very similar to A. sp-N49, of which the sole collection was made on the same Connecticut foray under similar conditions as the first collection assigned to the present species.

    We hope that continued research will sort out the issue of whether the two possibles species are, in fact, one. —R. E. Tulloss and C. Rodríguez Caycedo
    brief editors RET

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