When: 2011-05-22

Collection location: Lourinhã, Portugal [Click for map]

Who: zaca

No specimen available

The habitat of this specimen was a curious one: the roof of a small construction in the field (the clay-colored background in the photos is due to the ceramic tile). At first sight it seem to be something close to a sterile Diploicia, since I thought it had radiating lobes. Now, looking to the photographs of that day, I realise that the marginal lobes are those of a Physcia and, moreover, the same phenomena, previously noted in other observations, of “pustules dissolving into granulate soredia” was present close to the margin and soredia occupy most of the thallus, giving to it a unusual appearance. Thus it seems to be a Physcia clementei.


2012/08/08 – Revisited.
2012/08/08 – Revisited.
2012/08/08 – New specimens are developing here.

Proposed Names

58% (1)
Recognized by sight
66% (2)
Recognized by sight: (see comments about shape of lobe tips)

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


Add Comment
Blind photography!
By: Jason Hollinger (jason)
2012-08-16 11:20:13 PDT (-0700)

I know exactly what you’re talking about. Impressive you did as well as you did, then!

The problem here …
By: zaca
2012-08-16 11:07:15 PDT (-0700)

is that I have to shoot without seeing the object, because it grows on the roof of a small construction and I can saw the lichen at the horizontal level. It is the possible photographic record.

By: Jason Hollinger (jason)
2012-08-16 10:50:59 PDT (-0700)

The photos are taken at sufficiently different angle that I couldn’t line them up well enough to estimate percent change in area. Too bad! Granted, I didn’t try that hard. :) You can clearly see where it has grown a fair amount, though.

By: zaca
2012-08-16 09:33:47 PDT (-0700)

More than one year from the first observation I revisited the place and took new pictures that I already uploaded.

It seems that
By: zaca
2012-03-01 15:20:11 PST (-0800)

Jason was right again. Thanks to her and to Antonio, for their comments.

Diploicia canescens
By: Anto (Antonio Valero)
2012-02-27 21:13:34 PST (-0800)

Ok, parece Diploicia canescens


It is fair,
By: zaca
2011-06-04 12:32:22 PDT (-0700)

although many things can not be decided by vote. Like you, I guess, I’d be more interested in opinions than in votes. However, if it is an exercise to speak of lichens, the better.

We’re going to have to agree to disagree…
By: Jason Hollinger (jason)
2011-06-04 11:46:21 PDT (-0700)

Just looked at more photos of both species. I’ll propose my preferred name, but let yours “win”. I’ll let other users cast the deciding vote. I just ask that people look at these two photos, then yours, all three showing close-ups of the lobe tips, and decide which matches better…

Physcia clementei
Diploicia canescens

Your is by far the best photo of all the ones I saw! (of either species :)

Fair enough!
By: Jason Hollinger (jason)
2011-06-04 11:33:09 PDT (-0700)

That’s why MO is democratic… and why you get an “extra vote” as the observer. The burden is upon me to come up with something better if I really don’t agree with your identification. I have failed!

Sorry, but I can not agree with you Jason.
By: zaca
2011-06-04 10:43:03 PDT (-0700)

In fact, the problem is that the marginal lobes Diploicia canescens also tend to be flatter. Moreover, if we draw a contour line around a specimen of each species the one of Physcia clementeiis always more irregular that Diploicia canescens. Also, never saw in Diploicia canescens soredia in such quantity, which seems possible in Physcia clementei. To reinforce this view I quote cite the text from the description of Physcia clementei in CNALH relative to pustules: “pustules or isidia: laminal, often developing into granular soralia or craters that may fuse and cover the whole thallus”.

Looks more like Diploicia to me
By: Jason Hollinger (jason)
2011-06-04 08:07:23 PDT (-0700)

My reasoning: your other excellent photos of Physcia clementii show more separate, flatter lobes, and the pustules have a coarse isidioid stage before dissolving into coarse soredia. This thing has crowded convex lobes and the relatively finer, grayer soredia appear to originate immediately from the cortex without a pustulate or isidioid stage. These are all subjective distinctions, though, since I’ve seen neither species in person.

Created: 2011-06-01 11:19:07 PDT (-0700)
Last modified: 2012-02-27 21:40:55 PST (-0800)
Viewed: 206 times, last viewed: 2020-05-30 15:17:48 PDT (-0700)
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