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Stefan Jakobsson

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lichen on tree bark - Mycobilimbia sphaeroides?
Lothar Krieglsteiner, 27-02-2017 18:12
Lothar Krieglsteiner

On Thursday, during a seminar, we found a nice lichens with rosy-pink-lilac-brown apothecia in moist stage, in dry stage more ochraceous - on the bark of a living tree, likely Fraxinus, in Germany, Baden-Württemberg, Schwäbischer Wald near Gschwend-Schönberg, Osterbachtal.

I compared pictures and found Mycobilimbia sphaeroides very similar. Under the microscope I found spores of the right shape and form, but most of them are only 1-septate and not 3-5-septate as indicated in Wirth, for instance.

Is it M. sphaeroides anyway or does somebody have a better suggestion?

The paraphyses are guttulate in living stage, as are the spores. The asci seem to be fissitunicate and stain strongly blue with IKI. The first 4 micro-fotos are in water, the next two in IKI, the last two in KOH.

Regards from Lothar

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Lepista Zacarias, 27-02-2017 18:30
Re : lichen on tree bark - Mycobilimbia sphaeroides?
Hi Lothar,
Mycobilimbia pilularis fits quite well, since the macro coincides with your description and the spores are predominantly 1-septate, fusiform-ellipsoid, with dimensions (9.5-)11.5-13.9(-17) x (3.0)4.2-4.3(-5)um. In addition, it uses to grow on Fraxinus and Quercus (maybe others).
Have a look at
Best regards,
Lothar Krieglsteiner, 27-02-2017 18:45
Lothar Krieglsteiner
Re : lichen on tree bark - Mycobilimbia sphaeroides?

Hi Zaca,

thank you very much for your rapid answer!

In Wirth (1995 - "Die Flechten Baden-Württembergs") M. pilularis (Körber) Hepp is included as a synonym in M. sphaeroides (Dickson).

In Wirth (1980 - "Flechtenflora" - UTB Ulmer) a "pilularis" is not included, and Bacidia sphaeroides (Dickson) Zahlbr. is keyed out (page 131) with "sp. 4(-6)-celled, 12-25/4-7"

I do not have further literature on this topic.

So what?

Best regards from Lothar

Lothar Krieglsteiner, 27-02-2017 18:50
Lothar Krieglsteiner
Re : lichen on tree bark - Mycobilimbia sphaeroides?

I just looked in Index of Fungi

Biatora sphaeroides = Mycobilimbia pilularis


Lothar Krieglsteiner, 27-02-2017 18:54
Lothar Krieglsteiner
Re : lichen on tree bark - Mycobilimbia sphaeroides?

Hi Zaca,

where do you take the information about predominantly 1-septate spores? I do not find this on "Irishlichens". Am I only blind? ...

Thanks and best regards, Lothar

Lepista Zacarias, 27-02-2017 19:07
Re : lichen on tree bark - Mycobilimbia sphaeroides?
The data I mentioned is from
The Lichens of Great Britain and Ireland, Smith et al., 2009, BLS;
where Bacidia sphaeroides does not appear. I'm not very familiar with these species, so I can not say anything valuable.
Good luck,
Lothar Krieglsteiner, 27-02-2017 19:21
Lothar Krieglsteiner
Re : lichen on tree bark - Mycobilimbia sphaeroides?

Hi Zaca,

thank you very much anyway.

I jus found another book in my library :-):

Dobson, F.S. (2011, 6th edition): Lichens. An illustrated guid to the British and Irish species.

So - there I find (on page 281): Mycobilimbia pilularis (= Biatora sphaeroides). And the text: "Spores 1-septate (with a few older spores 3-septate)."

I can find my specimen within this :-)

So I think the determination can be kept - but still I do not know what name is to be used ...

Best regards from Lothar


Best regards, Lothar