Observation 199211: Pertusaria ophthalmiza (Nyl.) Nyl.

When: 2015-02-15

Collection location: Serra de São Mamede, Portugal [Click for map]

Who: zaca

No specimen available

Growing on bark of an oak tree.
Apothecia disciform but with a telotremataceae appearance and strongly pruinose.


Microscopy: Asci and spores (x 400) -3;
Microscopy: Apothecial sections and algal layer;
Microscopy: Asci and spores (x 100);
Microscopy: Asci and spores (x 400) -1;
Microscopy: Asci and spores (x 400) -2;
Microscopy: Spores (x 400).

Proposed Names

29% (1)
Recognized by sight
58% (1)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Microscopy added.
By: zaca
2015-02-19 16:08:09 PST (-0800)

Some features of these specimens:

- Thallus continuous, areolate at places, gray with a greenish hue, conspicuous fertile, verrucas with lecanorate apothecia, mostly 1 per verruca, disc dark colored, covered by a white pruina, with whitish sorediate margins, seeming more or less crenate and giving to apothecia an appearance characteristic of Telomatraceae family, as mentioned in the notes.
- The chemical tests on thallus and verrucas were all negative;
- The microscopy revealed that the spores are relatively big and fat, with dimensions:
(132.9) 149.2 – 168.7 (177.4) x (41.6) 44.6 – 69.2 (79.6) µm
Q = (1.9) 2.3 – 3.2 (3.5) ; N = 29
Me = 157.5 × 58.6 µm ; Qe = 2.7,
enclosed in relatively small asci (approximate dimensions: Me= 230 × 71 um (N=20)), 1 spore per ascum. The spores are smooth with a single wall variable in thickness, but commonly in the range 3 – 5 um.

This is my first find of a species with the above features and it key out in the key for the genus of the British Flora (see Ref. 1) as Pertusaria opthalmiza.
A description of this species is also available at Ref. 2. In Ref. 3 this species is compared with P. multipuncta and the two species are said to be anatomically and morphologically very similar, one easily mistaken for the other, but with different chemistry (_P. multipuncta reacts C-, K+ yellow, KC+ yellow). In fact, looking for the photos in Refs. 4 and 5, one can see such similarity.

Ref. 1 – British Flora: Smith et al. (Eds.); The Lichens of Great Britain and Ireland, The Bristish Lichen Society, 2nd ed., 2009.
Ref. 2: CNALH: http://lichenportal.org/portal/taxa/index.php?taxon=54874 [as Variolaria ophthalmiza]
Ref. 3: Magdalena Oset and Martin Kukwa, The lichen genus Pertusaria in Poland I. P. multipuncta and P. ophthalmiza, Acta Mycologica 45 (2): 231–238, 2010.
Ref. 4: Sharnoff Photos: http://www.sharnoffphotos.com/...
Ref. 5: Irish Lichens: http://www.irishlichens.ie/pages-lichen/l-382.html

Created: 2015-02-18 13:17:42 PST (-0800)
Last modified: 2015-07-16 16:24:30 PDT (-0700)
Viewed: 91 times, last viewed: 2018-02-23 10:52:48 PST (-0800)
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