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When: 2012-06-09

Collection location: Estádio Nacional, Oeiras, Portugal [Click for map]

Who: zaca

No specimen available

Once, more than one year ago, I observed at this same location a specimen of this lichen, but at the time I didn’t collect a sample. I have tryed to identify it without sucess. Some time after I saw in a forum similar image which was classified as Julella lactea. I returned to the place with the hope of seeing it again, several times without sucess, until today. This time I collect a sample and observed it under the scope: perfect match.
According to “CNALH” the genus Julella, having ascomata perithecial, is characterized by branched pseudoparaphyses, which are anastomosing above the asci and muriform ascospores. The species J. lactea has continuous thallus, smooth dull whitish surface, cylindrical to clavate asci (70-90 × 20-23 µm), and the are ascopores long ellipsoid to clavate, densely muriform, with dimensions: 22-28 × 9-13 µm.
I obtained the following average dimensions of the spores: Me = 22.6 × 12.6 µm ; Qe = 1.8 (N=13).


Chemical reactions

Proposed Names

29% (1)
Used references: CNALH
Based on microscopic features
Based on chemical features
87% (1)
Recognized by sight: See the Notes of observation 165386.

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= Observer’s choice
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Add Comment
I also should have checked,
By: zaca
2012-06-09 17:07:42 PDT (-0700)

instead of trying to see it.

[Edited: The first time that I saw the spores in water I thougt that it was an alga. Then I put a drop of IKI, and realize that were muriform spores.]

Sorry, should’ve checked
By: Jason Hollinger (jason)
2012-06-09 16:58:45 PDT (-0700)

This is common with the really thin epiphytic crusts, e.g., Arthonia, too. Just thought it would be good practice! I need to do the same thing: start checking the photobiont of species I know contain Trentepohlia.

I just saw that,
By: zaca
2012-06-09 16:52:08 PDT (-0700)

according to “CNALH”, the photobiont is absent in this species.

No, not up to now,
By: zaca
2012-06-09 16:48:20 PDT (-0700)

but I´m still trying.

Well done!
By: Jason Hollinger (jason)
2012-06-09 16:34:47 PDT (-0700)

This genus should have Trentepohlia (if lichenized at all!). Did you happen to note the algae?