Observation 211458: Humidicutis marginata var. olivacea (A.H. Sm. & Hesler) Singer

When: 2015-07-27

Collection location: Little Skookum, Mason Co., Washington, USA [Click for map]

Who: Steve (Lokness)

No specimen available

2cm, old growth like forest next to Western Red Cedar tree. Weather extremely hot and dry – but fruiting very close to boggy seep.


Hygrocybe nessii - 5.jpg
Humidicutis - 1.jpg
Humidicutis - 2.jpg
Humidicutis - 3.jpg

Proposed Names

46% (2)
Recognized by sight
28% (1)
Recognized by sight: H. nessii, the name in the filename of your image, is not valid. Where is it from?

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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One more try at Lodges comments
By: Steve (Lokness)
2016-01-24 06:56:54 PST (-0800)

I examined one of Steve’s collections and it is Humidicutis. It has no clamp connections in the context, while it does have clamp connections at the base of the basidia. Although it doesn’t have the toruloid (open loop like a donut) clamp connections on the base of the basidia, it does have toruloid clamps on the base of some basidioles. That isn’t uncommon in this group. The lamellar trama is subregular with hyphal elements 20-88 × 8-20 (-24) microns, and some are short and ovoid. The basidia are 4-spored, 25-44 × 7.2-8 microns, with long sterigmata. The basidiospores are (7.4-) 8.4-9.6 (-11.4) microns, which is too large for the descriptions of Humidicutis marginatus I’ve checked so far. I think the lamellar trama hyphae are too broad for the H. marginatus complex also, but I need to check further when I’m back in my office. The context is consistent with species of Humidicutis from Australia, but it is none of those species.

Dr. Lodge comments next post
By: Steve (Lokness)
2016-01-24 06:54:43 PST (-0800)

My observations;

Be sure and look down through the pictures as the mushroom matures. What is significantly different and what immediately caught my eye was the bright red fine line around the edge of the cap and the lower edge of the gills. It was striking and it was on all the mushrooms from three different groups over a period of maybe two months – and it was there from start to finish. The locations were close, but a very small stream separated one of the flushes from the other two – so if there was a physical connection it had to go under the stream. Could be though? There was maybe a total of 25 or 30 mushrooms I photographed over this period. Besides the red line there are other interesting characteristics; the mushrooms lack that gorgeous orange/peach color on the underside. They are pale almost translucent on the underside and they are smaller than the two examples of H.marginata var. olivacea. And the cap turned upward to form that goblet shape – without breaking. ………But the key I think is that red; is it a pigment? What causes it? Is this a different specie from H.marginata var. olivacea? Maybe a different sub-species, or hybrid, or quirk of nature? I don’t know. I do know they do not look the same.

More photos always help!
By: Jacob Kalichman (Pulk)
2015-08-08 11:46:53 PDT (-0700)
Humidicutis ?
By: Steve (Lokness)
2015-08-08 11:13:17 PDT (-0700)

Thanks for the comments and tip. I will follow up on that and hide my file name.

I don’t see the match to Humidicutis miniata olivacea and again it is my failings that would give others a wrong impression. The green that you see in the picture is of a very young example. It retains the green for a time but as it matures, the color fades to what I would describe as a “translucent off-white”. But here is the most significant characteristic; it always has the thin red line around the cap and on the gill edges. The line is narrow and it is VERY distinct. I don’t see that in any of the MO examples for olivacea nor do I see that red color in Google. (I need to add a mature specimen to the example here and when I have time and can figure out how to do it) When you look at all the pictures of this specie – green sure doesn’t come to mind as the dominate color but rather just hints of green. The dominate color is yellow or yellow/orange. Those colors never come to mind when you look at my example here. Also; Bassette etal list this Hygrocybe marginata var. olacea as being 2.5 to 6 cm. That is way bigger than the mushroom I have been watching. 2cm is a large one and most are smaller. I have watched maybe close to 30 mushrooms of this specie in the same location and they are all consistent. Thanks for the comments!

Filenames & Humidicutis
By: Jacob Kalichman (Pulk)
2015-08-08 10:29:55 PDT (-0700)

In Preferences on the left, you can choose to hide filenames. I don’t know of any good reason to show them to other users…

Humidicutis was solidly my first thought (“for sure!”) but I failed to find any good matches on Google, so I went way out on the Mycena limb… But now that you bring up Humidicutis again, I googled harder and H. marginata var. olivacea looks good!

filename “nessii”
By: Steve (Lokness)
2015-08-08 09:33:34 PDT (-0700)

Clearly an error on my part as I struggle to learn the nuances of MO. I apologize for any confusion. I had to call the file something as it was created on my computer and since I didn’t have a clue as to what I had and so I just used an arbitrary name. How do you get best responses from MO’s if you have no idea what the specie is?

I now believe best guess is a Humidicutis based on minds much better than mine who have looked at several pictures. Clearly as it doesn’t seem to match up well with the known Humidicutis more work with this small mushroom would be helpful.

myxomop – “nessii”
By: Jacob Kalichman (Pulk)
2015-08-01 16:12:56 PDT (-0700)

I was confused about that at first, too… realized it’s a play on words related to OP’s username.

Created: 2015-07-27 10:28:14 PDT (-0700)
Last modified: 2016-01-12 12:33:47 PST (-0800)
Viewed: 159 times, last viewed: 2018-01-27 07:19:27 PST (-0800)
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