Observation 159640: Physconia enteroxantha (Nyl.) Poelt

When: 2013-07-29

Collection location: Door Bluff Headlands County Park, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

Specimen available



Proposed Names

2% (2)
Recognized by sight
-1% (3)
Recognized by sight: Pale rhizines?
18% (2)
Used references: Identified by Jim Bennett

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I have two thalli
By: Jason Hollinger (jason)
2014-05-30 21:58:40 CDT (-0400)

One is very definitely the thing in the first photo. (Lovely specimen!) I can’t match the second thallus to either photo.

Dr. Bennet is so darned contrary!
By: Jason Hollinger (jason)
2014-05-30 21:56:27 CDT (-0400)

The specimen I saw clearly had a yellow medulla near the tips with all the correct chemistry. So there.

Of course, that doesn’t for a second rule out the possibility that both species are growing together. I can check the specimen you sent me to see if it happens to be the one you actually photographed here.

It’s actually from the same location.
By: Andrew Khitsun (Andrew)
2014-05-24 20:30:55 CDT (-0400)

So I wouldn’t call it the second report from the state – it’s just two different specimen growing near one another. Also, there were two thallii that I picked up on this particular log, assuming it’s the same species. I make this mistake every now and then, picking different species that grow together, not being able to tell them apart right away in the field. The specimen Jim Bennett had turned out to be P.detersa. One can actually see in the photos that they look different, but one was dry and another wet, which threw me off.

Definitely P. enteroxantha
By: Jason Hollinger (jason)
2014-05-24 02:43:14 CDT (-0400)

Making this the second report for the state?? :)

But the medulla (especially near the tips) was distinctly yellowish, K+y and KC+y. No question.

I always forget which Physconia are found where!
By: Jason Hollinger (jason)
2014-02-14 23:59:36 CST (-0500)

Tricky group. And don’t feel bad, zaca, North American lichenologists called all our sorediate Physconia P. grisea for many decades! Makes it very difficult to interpret old floristic papers.

(Adnrew, we clearly need to schedule a rematch with Dr. Bennett. :) I’ll get to those specimens you sent me… two years ago??? ack!… will get to them soon, promise… soon as I figure out how to actually get to them…)

Physconia enteroxantha still hasn’t been found in Wisconsin
By: Andrew Khitsun (Andrew)
2014-02-14 23:20:52 CST (-0500)

The lower surface at tips is white, which should rule out P.detersa (maybe). However, the soredia is anything but labriform, which should rule out P.leucoleiptes (maybe). Most importantly, medula takes on yellowish color with application of K, which would suggest P.enteroxantha (but it’s not yet listed from Wisconsin). Thomson mentions that P.leucoleiptes can have medula K+ yellowish too. Confused? I am. I’m also pretty sure that if I send one specimen of this to Jason and one to J.Bennett – they would disagree on the ID ;-)

By: zaca
2014-02-14 22:38:56 CST (-0500)
Physconia grisea not known from North America
By: Jason Hollinger (jason)
2014-02-14 15:12:15 CST (-0500)

Probably P. enteroxantha, P. leucoleiptes or P. detersa (based on presence of yellowish secalonic acid A in medulla and/or sorala).

Why grisea ?
By: Andrew Khitsun (Andrew)
2014-02-13 22:19:04 CST (-0500)

Created: 2014-02-13 21:40:47 CST (-0500)
Last modified: 2014-05-30 21:59:23 CDT (-0400)
Viewed: 74 times, last viewed: 2017-06-18 00:03:45 CDT (-0400)
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