Observation 93413: Leptogium rivale Tuck. (Site ID) (Scytinium rivale)

When: 2012-04-27

Collection location: Stehekin, Chelan Co., Washington, USA [Click for map]

Who: Richard Droker (wanderflechten)

Specimen available

on Si rock in Purple Creek, just outside “town”

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frequency of L. rivale
By: Richard Droker (wanderflechten)
2012-04-28 16:37:33 CDT (-0500)

Wikipedia refers to Stehekin as “a small unincorporated community” although later it uses the word “town”. Its pretty small.

I have the feeling that there are many lichens for which records are few but are just not on people’s radar. When out in the mountains I tend to look for L. rivale and Parmelia hydrothyria in every stream because they seem interesting. For the places that I visit most P. hydrothyria seems more common than L. rivale (if I recall correctly Glavich finds just the opposite), although that could be because the latter is easier to miss.

Lately I’ve been looking at a few specimens from the Deception Pass area and finding there is a really a lot that I previously missed or ignored. What more am I not seeing there?

(L. rivale tends to look like a crust.)

No apology required
By: Jason Hollinger (jason)
2012-04-28 02:56:54 CDT (-0500)

Thanks for the information. For unknown reasons I find myself suddenly without access to The Bryologist, but I think I got the critical point: it’s rare! No wonder I’ve never heard of it. :) Great find, and just out of “town”. Wow.

sorry for not including scale…
By: Richard Droker (wanderflechten)
2012-04-27 20:49:03 CDT (-0500)

I’ll have to find my specimen, but McCune and Geiser (2009) have a page on L. rivals, and say “lobes…rounded apices 0.2-1.0(1.5) mm broad”.

also “Most observers in the upright (standing) position will overlook the dark, tightly appressed rosettes…Look for it on rocks in and along clear cold streams in the mountains. L. rivals varies considerably in form, suggesting that it may include more than one species or that it shows great environmental plasticity.”

It is found along with Peltigera hydrothyria in Opal Creek, OR.

also see Glavich 2009 Distribution, rarity and habitats of three aquatic lichens… in The Bryologist 112(1);54-72

By: Jason Hollinger (jason)
2012-04-27 13:36:40 CDT (-0500)

Never seen this before. Hardly even heard of it. Only place I can find any information on it is in Goward’s “Lichens of British Columbia”. I take it this is really tiny? It’s hard to get the scale from this photo.