When: 2017-10-21

Collection location: Ruffner Mountain Nature Preserve, Alabama, USA [Click for map]

Who: Vitaly Charny (vcharny)

No specimen available


Proposed Names

30% (2)
Recognized by sight
-85% (1)
Recognized by sight
85% (1)
Based on microscopic features: thallus 50-70um thick; cortex of 1 layer of irregular isodiametric cells 7-13um thick; medulla dense, almost entirely cellular with only a couple 2-4-celled “columnar” hyphae; photobiont Nostoc but strictly unicellular; lobules and isidia absent but marigns very finely divided with “denticles” << 0.1 mm wide, lobes probably also < 0.1 or 0.2 mm wide but hard to distinguish one from the next, lobes strongly imbricate and weakly ascending, surface smooth at 40x

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= Observer’s choice
= Current consensus


Add Comment
You’re right, Vitaly
By: Jason Hollinger (jason)
2017-11-03 17:19:10 CDT (-0400)

This thing is beyond minute, verging on minuscule. Ha, to think I ever considered Sticta! So hard to estimate scale from photos. I’ve never seen a form like this, but look at the variation in the photos on-line. (Note that L. minutissimum – aptly named! – is a synonym.) It matches the description well given in:

Sierk, H.A. 1964. The Genus Leptogium in North America North of Mexico. The Bryologist 67(3): 245-317.

There’s also a suite of species segregated from L. denticulatum (think L. cyanescens with lobules instead of isidia). And some of these are similar to your specimen, especially the New Zealand species L. oceanicum, however you can see hyphae much more clearly in the thallus section photo given in Kitaura et al 2015 (pg. 19 photo D). In yours the medulla is almost entirely cellular and I had to search several sections extensively to find any of the “column” hyphae they talk about in that paper. I’m concluding that this does not belong to that group (Leptogium sect. Leptogium), instead in must belong to L. sect. Homodium. That’s the section with all those itty-bitty, rarely collected species like L. teretiusculum, L. tenuissimum, L. rivale, etc.)

Good find!

Leptogium imbricatum
By: Vitaly Charny (vcharny)
2017-10-24 13:47:32 CDT (-0400)
I wonder if it could possibly be…
By: Jason Hollinger (jason)
2017-10-24 13:42:35 CDT (-0400)

yet another form of the insanely diverse Leptogium cyanescens??

By: Vitaly Charny (vcharny)
2017-10-24 13:39:17 CDT (-0400)

Yes, it looks like Observation 128405
Just a location difference. This one found on soil in sunny spot. However that species no listed for Alabama we looks like have

Leptogium austroamericanum (Malme) C.W. Dodge +
Leptogium azureum (Sw. ex Ach.) Mont.
Leptogium burnetiae C.W. Dodge
Leptogium chloromelum (Sw. ex Ach.) Nyl.
Leptogium corticola (Taylor) Tuck. +
Leptogium cyanescens (Rabenh.) Körb. +
Leptogium denticulatum Nyl.
Leptogium hirsutum Sierk +
Leptogium isidiosellum (Riddle) Sierk
Leptogium marginellum (Sw.) Gray
Leptogium milligranum Sierk +
Leptogium phyllocarpum (Pers.) Mont. +
Leptogium saturninum (Dicks.) Nyl.

I saw half of them (marked with +) but those are different.
Thank you.

Similar to …
By: zaca
2017-10-24 11:31:47 CDT (-0400)
Upperside looks like lowerside
By: Jason Hollinger (jason)
2017-10-23 21:23:08 CDT (-0400)

Fascinating! Maybe a Leptogium, then? It will come to us, I’m sure. But right now, looks like nothing I’ve seen, either!

Butterfly season over
By: Vitaly Charny (vcharny)
2017-10-23 21:11:49 CDT (-0400)

Yes, it’s mostly over… But meanwhile I took some lichen pictures and get vouchers.

This lichen is much more tiny than any Sticta I saw. I tried to watch under microscope – but see no holes… the thalus looks like spread by layers;
upper and underside looks similar, no visible rhysine, isidia or soredia

Butterfly season over?
By: Jason Hollinger (jason)
2017-10-23 19:39:36 CDT (-0400)

Good to see you back here!