Observation 130244: Lachnellula agassizii (Berk. & M.A. Curtis) Dennis

Spores 6-8 × 2.5-3 microns. Not quite mature asci 45 × 5 microns. Paraphyses cylindrical 60 × 1.5 microns. “Stipes exceptionally long (1-2 mm)”.

Growing on bark of a fallen conifer branch (Tsuga?).

Proposed Names

57% (1)
Eye3 Eyes3
Used references:
H.O.Baral: DICHOTOMOUS KEY TO LACHNELLULA (worldwide), www.ascofrance.com/uploads/forum_file/7637.doc

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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OK, hairs
By: Sava Krstic (sava)
2013-03-16 12:57:47 PDT (-0700)

are “finely encrusted”, I suppose. Added a photo.

I used a small section from the cap edge that certainly had a lot of hairs (saw them on the dissecting scope), but had a difficulty isolating them on the slide. The asci were everywhere (some 75 microns). I couldn’t see a whole hair and count the number of septa on it.

By: Douglas Smith (douglas)
2013-03-16 12:21:34 PDT (-0700)

So, the “hairs” are smooth? No warts, the is interesting isn’t it? To make a mount of these I usually just grab a cup whole, and crush the whole thing. asci will be on one side, and the hairs on the other side. I usually have to crush ascis in any case to separate the asci from the paraphases in any case.

By: Elsa (pinknailsgirl)
2013-03-16 11:34:39 PDT (-0700)

Looking better at my photo, maybe they are on bark of a twig, at least some of them visible and with that diameter could be Lachnellula yes.

By: Sava Krstic (sava)
2013-03-16 11:06:17 PDT (-0700)

I just followed the key, using “hairs completely hyaline” and the spore information. I did try to look at the hairs, but the didn’t get a good slide. From what I saw, the hairs were not warted.

Interesting key
By: Douglas Smith (douglas)
2013-03-16 10:42:41 PDT (-0700)

Interesting key there, I might dig out some specimens and give that a try. But can you give some details on how you got to the id here? Are do you have any details on the “hairs” on the back of the ascocarp? Warted, how much?

By: Sava Krstic (sava)
2013-03-16 10:27:57 PDT (-0700)

The largest ones are about 3 mm across, and the height is also 3 mm max.

As for the habitat of Lachnellula, Baral says “growing exclusively on bark, more rarely wood or resin of conifers”.

I was
By: Elsa (pinknailsgirl)
2013-03-16 05:31:12 PDT (-0700)

thinking about Lachnellula and my obs. http://mushroomobserver.org/130168?q=18LCv, maybe in mine they are growing on pine roots (that I could confirm), but they are so tiny… and I don’t have any means of making a microscopy on them…

What’s the diameter?

Created: 2013-03-16 00:11:43 PDT (-0700)
Last modified: 2013-03-16 00:11:45 PDT (-0700)
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