Observation 70704: Amanita roseolamellata A.E. Wood
When: 2011-04-03
Herbarium specimen reported

Proposed Names

ret
60% (2)
Recognized by sight
ret
90% (2)
Eyes3
Recognized by sight: Gills have dried the salmony color that I’ve seen in almost all of Lucy’s specimens of roseolamellata. Fruiting body habit and coloring seems typical from our experience with Lucy’s material on MO.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Spore measurements
By: R. E. Tulloss (ret)
2011-07-06 17:05:49 WAT (+0100)

The spore measurements from the dried specimen are fully compatible with those from the Lucy’s other collections that I take to be A. roseolamellata. The combined data is available here:

< http://www.amanitaceae.org/?Amanita_roseolamellata >

This collection appears to have the most mature spores of all of the Little Hartley collections that I’ve reviewed so far. Apparently, the cap is rather slow to open compared to the Caesareae I’m familiar with in North America and judging maturity by the amount of expansion of the cap still seems to result in a difficult call. The whole experience with these little guys has been interesting.

Very best,

Rod

confused…
By: Debbie Viess (amanitarita)
2011-07-06 16:42:43 WAT (+0100)

I didn’t realize that this was an old sighting…the trouble with obsies getting bumped, I guess!

If you already had the material in hand, Rod, that’s a lot easier than these photo IDs!

So, with an annulus, wouldn’t this be roseolamellata? Oh wait, that’s what you just put it up as.

All righty, then. Maybe I’ll write Brandon Matheny about those striate Inocybes….

The stem does have an annulus..
By: R. E. Tulloss (ret)
2011-07-06 14:46:52 WAT (+0100)

In the dried material sent to me by Lucy, the dark horizontal line on the stem visible in some of these images is clearly the bottom of an appressed skirt (partial veil). This is a species of the Caesareae.

R.

Dunno…EDITED
By: R. E. Tulloss (ret)
2011-07-05 03:23:16 WAT (+0100)

So far the spores have not been pigmented when viewed under the scope. The color appears to be in the gills and appears to be variable. Sometimes it’s more distinct in dried material than in the photographs of fresh material.

I don’t know what the answer is with regard to decurrent lines from Inocybe gills.

I’m kind of tied up preparing for a trip right now. Lucy advises me that I have dried material of this specimen. I can confirm that it is accessioned here in the herbarium data base. I’m not sure when we can get to it. At this point, with a trip coming, I’ve got my hands full.

Very best,

R.

Thank you Britney
By: R. E. Tulloss (ret)
2011-07-05 03:18:24 WAT (+0100)

Your kind words are appreciated.

Very best,

Rod

Ret
By: Britney Ramsey (Riverdweller)
2011-07-04 21:04:13 WAT (+0100)

Once again, thank you for the time you take to teach these things.

what IS it about those pink gills anyway?
By: Debbie Viess (amanitarita)
2011-07-04 20:38:35 WAT (+0100)

two species of amanita in the same habitat, both with pink gills???

what color are the spores?

did these ever have an annulus? does roseolamellata lose its annulus sometimes, like other annulate amanitas do?

looking a bit harder at the cap, I can see a striate edge, another reason that it’s probably NOT a volvopluteus.

still, so pink!!!

I have certainly noticed striations at the apex of some amanita species, but I also see apical striations with some of the Inocybe species. what causes these?

striations on the top of the stipe and surface of annulus in Amanita
By: R. E. Tulloss (ret)
2011-07-04 14:47:52 WAT (+0100)

Thanks, Irene, for giving me the opportunity to write about something that, I think, people really need to appreciate about Amanita development…particularly as it is associated with the gill edges and the striations seen on the tops of stems and the tops of membranous partial veils.

Many people realize that Amanita is unique among the agaric genera in developing its fruiting body within a solid primordium. Even the sister genus of Amanita, Limacella, develops by first growing an initial stem, then a cap, then gills that grow down into EMPTY SPACE.

A major evolutionary event took Amanita development onto a different track.

When a developing Amanita approaches the time to begin expanding, its gills are interconnected to each other, and their edges are interconnected to the adjacent tissue of the developing primordium (which may be the stem or a partial veil…according to the species involved). If there were not a tissue in this region “programmed for dissolution or destruction,” then the stem and the cap would have a “tug of war” that could pull the gills apart.

The lamella edge tissue of an Amanita (which a very few mycologists may still insist on calling cheilocystidia) is the agaric world’s answer to “single use velcro.” In the cases which I have examined in detail, this tissue is based on a cable-like set of hyphae that run along the bottom edge of the gill roughly parallel to that edge. (Since the word “parallel” refers to straight lines and since the edge of the gill is curved, the word “periclinal” is probably better than “parallel”. “Periclinal” means roughly “along the curve.”)

From the point of the observer looking at the “cable” AFTER separation of the gills from their formerly adjacent tissue, it appears as though hyphae arising from the cable (over a relatively short distance) give rise to chains of inflated cells. These chains of cells are very easily broken apart (“easily dissociating”). Parts are left on the gill edge (the famously “minutely flocculose” edge seen in many species of Amanita) and parts are left on the formerly adjacent surface. The latter form the striations on the top of the stem or on the upper surface of a partial veil.

Having no further use, the remaining inflated cells from the broken chains begin to collapse and gelatinize. If you have ever seen small, collapsed, yellowish or otherwise pigmented cells floating around in a gill mount while you are trying to measure Amanita spores, then you have seen the remains of the “velcro” after it has had its single use.

Why aren’t the cells of the “velcro” properly called “cystidia”? Cystidia are single terminal cells growing on a surface. These cells are in chains in specialized tissue originating very close to the “core” of a primordium. Cystidia are differentiated from the cells adjacent to them. In the present case, a uniform tissue is comprised of the inflated cells of the lamella edge tissue.

Why does it feel like I’m talking about a “special case”? Because I am. No other genus requires such cells to complete the development of a fruiting body.

I hope this was clear. If it is clear, I hope that lots of people will read it. Tell your friends. :-) A brief discussion of the lamella edge tissue of amanitas can be reached by a link (on the left) of every taxon page on www.amanitaceae.org (WA0).

Very best,

Rod

Thanks, ret
By: Irene Andersson (irenea)
2011-07-04 08:08:49 WAT (+0100)

for the explanation!

I was wondering about the striations on the stem top, which I beleive is a character on some Amanitas with a ring. But yes, I can see the resemblance with the other obses of roseolamellata..

A note…
By: R. E. Tulloss (ret)
2011-07-04 02:25:04 WAT (+0100)

This material was in the midst of the Eucalyptus-populated yard that has produced several collections of Amanita roseolamellata that were posted on MO…as well some rather similar looking collections that lacked a ring…and may or may not be the same species. The Utah specimen of Volvopluteus has very distinctive spore coloring on the upper stem.

very best,

R.

got scope?
By: Debbie Viess (amanitarita)
2011-07-03 23:22:37 WAT (+0100)

check gill trama.

also, spore drop…this sure looks pink spored to me (and Irene, apparently).

Volvopluteus, as the name suggests, also has a volva and is exannulate.

Created: 2011-07-02 08:01:10 WAT (+0100)
Last modified: 2012-03-03 11:23:26 WAST (+0200)
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