Observation 70326: Ramalina sinensis Jatta

When: 2011-06-23

Collection location: Carnaxide, Oeiras, Portugal [Click for map]

Who: zaca

No specimen available


Section exposing medulla-I
Section exposing medulla-II
2nd specimen.
2nd specimen.
A tree nearby.

Proposed Names

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Many thanks, Jason.
By: zaca
2011-06-30 19:50:07 CDT (-0400)
Here’s the full description from Thomson’s paper
By: Jason Hollinger (jason)
2011-06-30 18:59:57 CDT (-0400)

The thallus is composed of a single, fan-shaped
lobe, from tiny when very young to as much as 12
cm broad, attached by a single holdfast to the sub-
stratum. It is flat, dark-green, with longitudinal ridges
between which are sparse pseudocyphellae. The
apothecia are common, to 12 mm broad, pedicil-
late, occurring on the edges and surfaces; the disk
is pruinose; the spores 8 per ascus, curved, two-
celled and 12-18 × 5-6 um.

The reactions are negative with K, C, P, yellow
with KC. This contains only usnic acid in TLC
(checked by Chicita F. Culberson).

[Yes! Nice location! Oooh, and I see Teloschistes in that last photo, too. One of my favorites. :)]

Very interesting …
By: zaca
2011-06-30 17:44:03 CDT (-0400)

Do you know anything about the spores characteristics of P unifolia and what differences for those of P. sinensis?
At the same day I found another specimen with similar features – I already uploaded two (bad) photos of it. It seems to me that can be another species, but I not sure. This one has two lobes and also only terminal apothecia, but the consistence of the thallus look different from the other one.
Let me end by saying that this seems to be the “correct place” for someone that want to study Ramalina spp. (see the last photo).

By: Jason Hollinger (jason)
2011-06-30 17:13:47 CDT (-0400)

This is an excerpt from the introduction of the paper describing R. unifolia:

“…The other [specimen from a location in Minnesota, USA] was thought to be R. sinensis Jatta, partly because of the abundant nerves on the surface. But unlike that multibranched species this develops as a very broad and distinctively monophyllous thallus with usually abundant laminal as well as lateral and terminal apothecia. It was confused with R. sinensis because of the abundant nerves on the surfaces, the partly decorticate interspaces on the lower surface, and the curved spores. Ramalina sinensis usually has a number of narrower lobes, marginal and terminal apothecia, rarely any laminal ones, and often lanceolate processes along the edges and at the tips of the lobes. Ramalina unifolia, in contrast, has a single lamina, usually with abundant laminal as well as marginal and terminal apothecia, and none has been seen with any lanceolate processes at the edges.”

It describes your situation almost perfectly, however… It looks like your specimen has exclusively terminal apothecia. Alas. I was beginning to think for a second that you’d found a significant range-extension for this poorly-known species!

I never heard of Ramalina unifolia
By: zaca
2011-06-30 16:04:49 CDT (-0400)

and it doesn’t appear in the checklist of Portugal, Madeira or Azores neither in the checklist of the neighbor country Spain.

Sorry, Imeant Ramalina unifolia not R. usnea!
By: Jason Hollinger (jason)
2011-06-30 11:03:46 CDT (-0400)

I can’t find any photos of it right now, though… (And Sharnoff’s photo of R. sinense looks exactly like yours, it’s just that in my limited experience, R. sinense is better-developed and more branched than this…)

Does Ramalina usnea occur in Portugal?
By: Jason Hollinger (jason)
2011-06-30 10:56:53 CDT (-0400)

This looks like a good match from the photos I’ve seen. Just a thought.

Created: 2011-06-27 17:02:13 CDT (-0400)
Last modified: 2011-06-30 17:35:21 CDT (-0400)
Viewed: 107 times, last viewed: 2018-08-14 14:40:49 CDT (-0400)
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