Observation 213271: Abrothallus welwitschii Tul.

When: 2015-08-18

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

Who: zaca

No specimen available

Lichenicolous fungi (lichen) growing on Sticta limbata.

Species Lists


Microscopy: Section of perithecium;
Microscopy: Other sections of perithecia;
Microscopy: A look inside the perithecia;
Microscopy: Spores.
Revisited (2016-07-02).
Revisited (2016-07-02).

Proposed Names

-29% (1)
Recognized by sight
29% (1)
Recognized by sight
58% (1)
Used references: named suggested at the forum Ascofrance; see the following page:
Based on microscopic features

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

= Observer’s choice
= Current consensus


Add Comment
Revisited – New photos added.
By: zaca
2016-07-09 10:53:24 PDT (-0700)
New reference based on material from California:
By: zaca
2015-10-01 08:52:53 PDT (-0700)

Ref. 5: McGee, M. (2003) Abrothallus welwitschii in California on Sticta limbata. Bulletin of the California Lichen Society 10(2): 39.

Great work!
By: Jason Hollinger (jason)
2015-09-29 17:23:29 PDT (-0700)

You are far ahead of me in this group. Yes, please send me pdfs of these four papers if it is convenient for you. I should have access to the second, but I’ve been having trouble with my subscriptions recently, and haven’t had time to straighten the matter out.

Thanks for your help!

Sorry, it was my foult, but …
By: zaca
2015-09-29 13:21:32 PDT (-0700)

… due to the lack of time I did not justify my proposal.
Let me start from the begining. I posted this observation and some time after a topic at Ascofrance on the same subject (see the link given at references). It happens that the person who suggested Abrothallus welwitschii is one of the world experts on the subject, Javier Etayo, who as several papers on the subject (as you can see at Ascofrance he said that will send some, but up to now he didn’t). Before him a french lichenologist, Alain Gardiennet, suggested Bachmanniomyces santessonii. In fact, what one can see in my photos is the anamorph version of Abrothallus welwitschii, with pycnidia and not the telemorph version, which has apothecia.
Then I made my own research on the subject and came to the conclusion that Bachmanniomyces santessonii was the same that Vouauxiomyces santessonii, which was described by D. Hawksworth in [Ref. 2] and was mentioned as the anamorph of Abrothallus parmeliarum. Before this author published a big work on Coelomycetes [Ref. 1]. I also saw that Sergio Perez-Ortega and its collaborators recently have established the connection between anamorph and telemorphs for some Abrothallus spp. [Refs. 3 & 4]. I contact them and they immediatly reply making copies of these works available to me. I’m still reading these papers.
Summarizing, I think that now I have the main references on this subject and if you need some, let me know.
Finally, Yes I have the 3 volumes of the Sonoran Flora.

Ref. 1: D. L. Hawksworth, The lichenicolous Coelomycetes, Bulletin of theBritish Museum (Natural History), Botany series Vol 9 No 1, 30 July 1981


Ref. 3: Sergio Pérez-Ortega, Ave Suija and Asunción de los Ríos, The connection between Abrothallus and its anamorph state
Vouauxiomyces established by Denaturing Gradient Gel Electrophoresis (DGGE), The Lichenologist 43(3): 277–279 (2011)

Ref. 4: Ave Suija, Asunción de los Ríos and Sergio Pérez-Ortega, A molecular reappraisal of Abrothallus species growing on lichens of the order Peltigerales, Phytotaxa 195 (3): 201–226, 2015

I think the structures shown may be conidiomata, not ascomata
By: Jason Hollinger (jason)
2015-09-29 11:55:48 PDT (-0700)

Did you see any asci? I can’t, in these photos at least. Instead, I see hyaline conidiophores and truncate conidia.

Do you have the Sonoran Flora vol. 2? I can send you a copy of the key to genera of anamorphic ascomycete lichenicolous fungi. It might not help here though… the only possibility that works is Abrothallus, haha! Too bad the key to Abrothallus in the Sonoran Flora doesn’t work for anamorphs. And unfortunately, the conidiomata of A. welwitschii have never been studied. :(

Note that in the genus description, the conidia are described as “hyaline to pale yellow, obpyriform to ellipsoid, collecting in a mucilaginous mass, simple, basally distinctly truncate, surface finely verruculose”. Conidiomata themselves are described as “pycnidial, black, partly immersed or superficial, ostiolate; wall: pale to dark blackish brown; conidiophores: absent; conidiogenous cells: hyaline, holoblastic, ampulliform”.

(Oops. Those are conidiogenous cells, not conidiophores. What’s the difference??)

Microscopy added; No conclusion!
By: zaca
2015-08-30 06:34:10 PDT (-0700)

I have tried unsuccessfully to identify this lichenicolous fungus. Having the data from the microscopy in mind I searched the website
for species having Sticta as host. There are quite a number of them. Searching the internet for the possible genera I could not find one with such combination of perithecia and spores. The spores are hialine, simple, guttulate (mostly with one or two drops), many of them have one of the ends plane (truncate), with the following dimensions:
(6.9) 8.5 – 11.7 (12.2) x (5.2) 5.6 – 6.9 (7.6) µm
Q = (1.1) 1.3 – 1.9 (2.1) ; N = 35
Me = 9.8 × 6.2 µm ; Qe = 1.6 .

Created: 2015-08-19 04:23:57 PDT (-0700)
Last modified: 2016-07-09 10:52:51 PDT (-0700)
Viewed: 119 times, last viewed: 2019-05-23 12:45:37 PDT (-0700)
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