Observation 18778: Amanita pantherina group
When: 2009-02-22
Herbarium specimen reported

Notes: I collected this from under Douglas-Fir (no pine or oak in the area).

Pileus: Broadly convex – plano-convex, with small, flattish universal veil remnants, medium-light tan-brown coloration (no yellow or orange tones), and a non-striate margin.

STIPE: 110 mm tall, 13.5 mm thick at base, 8.4 mm thick at apex, glabrous, firm, solid but for a small-diameter central cylinder stuffed with a pith.

PARTIAL VEIL: small, median-superior, sheathing upward, fairly persistent, with small distinct patches at the margin.

With PURPLE STAINS on one side of a cut through the stipe after overnight storage. I would say that this is a one-time idiosyncratic reaction, but I collected a similar specimen two years ago (near Douglas-Fir and Oak) that had the same purple-blue tones on the stipe when just-picked. (Photos to come if I can find them).
still obvious after drying

VOLVA: Short, even, non-appressed collar, not particularly swollen or rooting.

Cells of sterile margin: Clavate to weakly capitate.

BASIDIA: NO CLAMPS OBSERVED, after searching for 30 minutes using 1000x on a squash mount stained with congo red and phloxine and cleared with KOH.

The spores were ellipsoid, with Q = 1.57 (no truncation) 1.6 (rounded for significant figures).

The following measurements are in units at 1000x, 0.96 microns per unit.

14.5 × 7.5 (Q max)
12 × 8
11 × 7
13 × 7.5
12 × 8
13 × 8
11 × 8 (Q min)
11 × 7
11.5 × 8.5
12.5 × 8.5
12 × 7
11 × 7.5
11 × 7.5
11 × 7
11 × 7.5
12 × 8
12 × 7
10.5 × 6.5
13 × 7.5
13 × 8

L avg. = 11.4 μm, L max = 13.9 μm, L min = 10 μm
W avg. = 7.2 μm, W max = 8.2 μm, W min = 6.2 μm
Q avg. = 1.6, Q max = 1.9, Q min = 1.4

Images

37289
Copyright © 2009 Christian F. Schwarz
Scale in cm.
37290
Copyright © 2009 Christian F. Schwarz
37291
Copyright © 2009 Christian F. Schwarz
37292
Copyright © 2009 Christian F. Schwarz
Rim of volva and purple stains.
37293
Copyright © 2009 Christian F. Schwarz
Purple stains.
37294
Copyright © 2009 Christian F. Schwarz
PV from above.
37295
Copyright © 2009 Christian F. Schwarz
PV from below.
37296
Copyright © 2009 Christian F. Schwarz
Rim of volva.
37297
Copyright © 2009 Christian F. Schwarz
Sterile lamellar margin.
37298
Copyright © 2009 Christian F. Schwarz
Basidia.
37299
Copyright © 2009 Christian F. Schwarz
Spores.

Proposed Names

57% (1)
Eye3 Eyes3
Recognized by sight
Based on microscopic features: Absence of clamp connections at base of basidia, ellipsoid spores in correct size range.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
interesting data…
By: R. E. Tulloss (ret)
2009-02-24 05:55:30 GMT (+0000)

In my files, I have notes on six species from the western U.S. with clampless basidia and spores in the size/shape range described by Christian. Only one has a name so far as I know (A. aprica) and Christian’s photographs are not typical of that species as far as I know it. The spores are larger and narrower than the spores of the European pantherina. I’d say that the chances are that the species is undescribed.

There are no cystidia on Amanita gills. Because, Amanita basidiomes develop from a solid mass of tissue, the gill edge has to have a mechanism for separating from the stipe or the upper surface of an annulus. Hence, the tissue that develops on the gill edge is very specialized to the genus and is very friable. In the cases that I have examined, I find that there is a sort of loosely woven cable of hyphae along the gill edge that has branches that terminate in inflated cells of various shapes (singly or in short chains). These cells easily break away from each other. The lines left on a stipe apex or the lines on the top of an annulus are made up of these cells. The gill edge cells collapse and fall away from the gill edge rather rapidly. At any rate, they are not cheilocystidia. Limacella is basal to Amanita so far as is now known from molecular work. Limacella has a fertile gill edge. One might assume that, long ago, ancestral pre-amanitas had a fertile gill edge before the genus evolved its present, curious mode of fruiting body development.

Nice work, Christian.

Very best,

R

uh oh, I don’t mean to be conspiratorial, but…
By: Debbie Viess (amanitarita)
2009-02-24 01:33:38 GMT (+0000)

we had an apparent fibrillosus with unexplained purple staining on it recently, too. Could they somehow be related as to cause? The case of the curious purple staining? Keep gatheriing those clues!

as to host specificity in pantherina…this mushroom seems to have a wide variety of hosts. in the East Bay I have found it under pine and oak and madrone. why not doug fir, too? the broader your host specificity, the more successful you can be, and pantherina, in its various varietal permutations,
seems to be in a lot of places.

Created: 2009-02-23 22:59:41 GMT (+0000)
Last modified: 2009-02-23 22:59:41 GMT (+0000)
Viewed: 63 times, last viewed: 2016-03-21 10:06:07 GMT (+0000)