Observation 97959: Sticta beauvoisii Delise

When: 2012-06-20

Collection location: Parque Ecoturistico El Colibrí, Ixtapaluca, Mexico, Mexico [Click for map]


Who: Alan Rockefeller (Alan Rockefeller)

No specimen available

Unusually small size. Found near observation 97958.


After a couple days
After a couple days

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Thanks, Jason,
By: zaca
2012-06-22 22:03:33 SAST (+0200)

you are completely right, I interpreted the isisdia/phyllidia as soredia. Also, very nice work in explaining the features of the various possible species.

Thanks, Alan
By: Jason Hollinger (jason)
2012-06-22 21:34:03 SAST (+0200)

Zaca, I think if you look closely, you can now definitely see tiny phyllidia, not soredia. There are apparently still several species to consider even after ruling out S. limbata. The phyllidia/isidia are strictly marginal (and on some cracks), so that should rule out S. fuliginosa and S. sylvatica. No cilia, so not S. nashii. Not wrinkled or punctate, so not S. leucoblephara. that leaves:

S. beauvoisii — marginal isidia, but I’ve seen these isidia turn into phyllidia sometimes
S. mexicana — marginal phyllidia, but very broad lobes, so it doesn’t seem promising
S. xanthotropa — marginal phyllidia and narrower lobes, but “suffused yellowish when dry”, and I’m not seeing yellow at all, anyone else?

So I guess this must “just” be plain old boring S. beauvoisii. :) It’s an astonishingly variable species, so no surprise this one is smaller than usual or has phyllidioid isidia. Color and shape and cyphellae and tomentum underneath are all appropriate.

No hairs around the margin
By: Alan Rockefeller (Alan Rockefeller)
2012-06-22 21:10:10 SAST (+0200)

The top is completely smooth, including at the margin. I added a couple more pictures that I just took. By dry do you mean not wet from rain, or crispy dry?

If you would like to see any microscopy let me know while I still have it.

Hi Alan,
By: zaca
2012-06-22 19:59:38 SAST (+0200)

I think that the cyphellae on the underside points to the genus Sticta instead. On the other hand, the wavy and more or less crenate margin of lobes makes me guess that maybe S. limbata. I never found such species and probably there are other options. See Macrolichens of the Pygmy Forest for a short description and photo.

Note the round “craters” underneath
By: Jason Hollinger (jason)
2012-06-22 19:59:26 SAST (+0200)

This is Sticta. I’m trying to determine the species, but it’s not easy with it wet like this. Need to know the color when dry, as well as whether there are hairs around the margin. Would be good to find a proper treatment of the genus for Central America, too: the Sonoran Flora doesn’t really go so far south.

Created: 2012-06-22 12:31:33 SAST (+0200)
Last modified: 2012-06-22 21:38:37 SAST (+0200)
Viewed: 70 times, last viewed: 2017-06-13 10:49:14 SAST (+0200)
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