Amanita longicuneus - Amanitaceae.org - Taxonomy and Morphology of Amanita and Limacella
[print] [map]
name Amanita longicuneus
name status nomen provisorum
author Tulloss, Kudzma, S. D. Russell & K. W. Hughes
english name "Long Wedge Ringless Amanita"
images
  • Amanita longicuneus, Shark River Co. Pk., Monmouth Co., New Jersey, U.S.A.  (RET 235-4)Amanita longicuneus, Shark River Co. Pk., Monmouth Co., New Jersey, U.S.A.  (RET 235-4)

    1. Amanita longicuneus, Shark River Co. Pk., Monmouth Co., New Jersey, U.S.A.  (RET 235-4)



  • 2. Amanita longicuneus, drying in situ, Great Smoky Mtns Nat. Pk., Sevier Co., Tennessee, U.S.A.   (RET 374-9)


  • 3. Amanita longicuneus, Mt. Tuscarora, Cold Spring, Allegany St. Pk., Cattaraugus Co.,New York, U.S.A.   (RET 699-3)



  • 5. Amanita longicuneus (formerly sp-ONT030), Walsingham, Ontario, Canada (RET 509-6).


  • 6. Amanita longicuneus (formerly sp-ONT030), Walsingham, Ontario, Canada (RET 509-6).



  • 7. Amanita longicuneus (formerly sp-ONT030), Walsingham, Ontario, Canada (RET 509-6).

    • intro This page is under reconstruction.  Elements removed from this page (for the most part) have been placed on three new pages representing these temporary codes or provisional names: Amanita salmonriverensis, A. sp-longicuneus03, and A. sp-longicuneus04.

    Amanita sp-ONT03 will be merged into the present page.

    The specimens of the Amanita sp-GSM05 are merged with A. longicuneus and the temporary code name "A. sp-GSM05" will be abandoned.
    cap The cap of A. longicuneus is 44 - 68 mm wide, pale brown with dark brown over disc or gray with brownish cast and darker in the center.  Old wounds become pallid ochraceous to brown.  The shape is convex at first, then plano-convex, subumbonate to umbonate; with age, it may develop a somewhat depressed disk.  The surface is tacky when moist and subshiny to shiny.  The flesh is white to a very palely sordid white and sordid to concolorous with the cap just under the cap's skin; it may sometimes take on a faint pink flush on a newly cut surface, while older cut surfaces become rusty to sordid to pale brown.  The cap's margin is striate to tuberculate-striate, and the striations occupy 40% to 60% of the cap's radius.  Volval remnants are absent or sometimes are present as a large tough patch (at times with raised edges) that is whitish with rusty spots or eventually becomes completely orange-brown.
    gills The gills are free to narrowly adnate, sometimes with a short (occasionally very short) decurrent line on the upper stipe.  They are close to subcrowded to crowded, white to whitish to pale cream to cream in mass and white to watersoaked white in side view. They may sometimes grow together here and there or (occasionally) fork.  The short gills are truncate to subtruncate to rounded truncate, rarely attenuate, of diverse lengths, plentiful, and unevenly distributed.
    stem The ringless stem is 61 - 125 × 5 - 10 mm, white to off-white or dingy white, becoming pale brown to orange-brown to brown from handling, narrowing upward, flaring at apex (sometimes minimally), smooth to pruinose above, and minutely scurfy or with minute upward-pointing fibrillose scales below (with fibrils taking on brownish or sordid tinge).  The stem flesh is white to off-white to very pale yellowish white to very pale orange-white, pale brown to brown when cut or bruised, sometimes with ochraceous spots, and sometimes faintly pinkish on newly cut surfaces.  The stem is hollow to stuffed.  The volva is sack-like, abruptly flaring, membranous, smooth, whitish, and 11.5 - 41 × 14.5± mm.  It is more or less attached to the stem for about one-half to two-thirds (rarely one-quarter) of its height.  Its proposed name relates to an unusually long and rather thin internal limb of the volva (at times nearly as long as the free part of the sack) arising where the volva is attached to the stem and eventually becoming appressed to either inner surface of the volva or to the stem.
    odor/taste This species is both odorless and tasteless.
    spores The spores measure (8.7-) 9.6 - 12.5 (-14.5) × (8.2-) 9.0 - 11.5 (-14.0) µm and are globose to subglobose (infrequently broadly ellipsoid) and inamylloid.  No clamps are to be found at bases of basidia.
    discussion This entity is known from only Connecticut and New Jersey, U.S.A., at the present time.  It is not a rare find in its fruiting season.

    The distinguishing character of this species (within its known range) is the form of the internal limb of the volva.  When the fruiting body is cut in half lengthwise, the volval sac is seen to have two limbs. The outer limb covered the entire mushroom during its early development.  The inner limb (which also completely encircles the stem), was between the stem and what became the free edges of the gills during development.  In this species, the shape of the cross-sectioned inner limb is that of a very long and narrow wedge.

    On this site, the species has also been known under the names Amanita sp-GSM05 and A. sp-longicuneus01.—R. E. Tulloss
    brief editors RET

    [top]