Search found 255 matches

by Mark Powell
Sat Feb 01, 2025 6:51 pm
Forum: Lichens
Topic: Yet another Psoroglaena stigonemoides?
Replies: 5
Views: 176

Re: Yet another Psoroglaena stigonemoides?

I think you have effectively disproved my suggestion of Vezdaea. The fruiting bodies do appear to be perithecia (based on your description and the micrographs which appear to show flask-like structures) and you have failed to see haustoria. Hopefully my (probably wrong) suggestion at least helped ...
by Mark Powell
Sun Jan 26, 2025 4:51 pm
Forum: Lichens
Topic: Possible Catillaria fungoides
Replies: 4
Views: 99

Re: Possible Catillaria fungoides

After my initial discovery of C. fungoides I started looking for more blackish crusts and came across a lot of the sort of crust that you have found on the cherry trunk. These crusts appear to be a mixture of cyanobacteria, algal cells and dematiaceous fungal hyphae. Such mixed crusts also occur on ...
by Mark Powell
Sat Jan 25, 2025 10:03 am
Forum: Lichens
Topic: Yet another Psoroglaena stigonemoides?
Replies: 5
Views: 176

Re: Yet another Psoroglaena stigonemoides?

Peter,
I'm sorry you have had to wait so long for a response. I was unsure what to make of your lichen and waited to see if anyone else could provide a more definite answer than I was able to. I have to say that I doubt it is P. stigonemoides , the fruiting bodies seem rather too inconspicuous, the ...
by Mark Powell
Fri Jan 24, 2025 6:59 pm
Forum: Lichens
Topic: Possible Catillaria fungoides
Replies: 4
Views: 99

Re: Possible Catillaria fungoides

I think it is likely that you have found C. fungoides but rather than give what would only be a hesitant confirmation I will provide some thoughts which might help you. I haven't seen enough fertile specimens of C. fungoides to explore any supposed differences in the apothecia between it and C ...
by Mark Powell
Tue Dec 17, 2024 9:42 am
Forum: Lichens
Topic: Psoroglaena stigonemoides
Replies: 3
Views: 145

Re: Psoroglaena stigonemoides

HI Neil,
Very many thanks for alerting me to Psoroglaena neglecta. It does sound like a good possibility for my sorediate Psoroglaena. As you suggest, it is probably unwise to make any definite assumptions without sequencing. I will post a couple of images below of the material on old Platanus ...
by Mark Powell
Sun Dec 15, 2024 10:33 pm
Forum: Lichens
Topic: Pyrenidium actinellum on Caloplaca teicholyta
Replies: 1
Views: 108

Re: Pyrenidium actinellum on Caloplaca teicholyta

I have certainly been recording such material on C. teicholyta as Pyrenidium actinellum. It is not uncommon in churchyards in the Home Counties and seems to particularly favour gently sloping thalli of C. teicholyta on church windowsills.

As hinted at the following link, 'P. actinellum' may not be ...
by Mark Powell
Sun Dec 15, 2024 10:20 pm
Forum: Lichens
Topic: Psoroglaena stigonemoides
Replies: 3
Views: 145

Re: Psoroglaena stigonemoides

I would be happy to record your specimen as Psoroglaena stigonemoides. In fact it is rather classic material and the only thing missing is some perithecia (which are rather rarely present in my experience). The ecology is perfect and this along with the minutely fruticose structure immediately ...
by Mark Powell
Thu Nov 21, 2024 1:30 pm
Forum: Lichens
Topic: Punctelia reddenda?
Replies: 4
Views: 127

Re: Punctelia reddenda?

I am rather hopeful that you have indeed found Punctelia reddenda . Rather than provide absolute confirmation, I will provide opportunity for others to add weight, or cast doubt. Your lichen seems clearly to be a species of Punctelia being a parmelioid with soredia forming from punctiform spots and ...
by Mark Powell
Thu Nov 21, 2024 1:07 pm
Forum: Lichens
Topic: British Lichen Society AGM 2025
Replies: 2
Views: 116

Re: British Lichen Society AGM 2025

At the link that Fay has provided, I notice that a document has been provided. This is a report of my findings from when I looked at lichens in Hyde Park in 2018. The post-AGM meeting aims to visit Hyde Park and the adjacent Kensington Gardens on Sunday 12th January 2025, so you can get an idea of ...
by Mark Powell
Sat Apr 27, 2024 9:02 am
Forum: Lichens
Topic: Dorset, Anisomeridium viridescens?
Replies: 4
Views: 624

Re: Dorset, Anisomeridium viridescens?

I agree with Neil that the apparent presence of a distinct whitish thallus suggests that this isn't A. viridescens. Although we don't have a scale, judging by eye against the Physcia, this perhaps looks a bit chunky for A. polypori. I am going to tentatively suggest that you also consider A. biforme ...
by Mark Powell
Fri Apr 19, 2024 10:30 am
Forum: Lichens
Topic: Lichen on Little Asby limestone
Replies: 8
Views: 856

Re: Lichen on Little Asby limestone

I meant to add that the rather strange appearance of the apothecia may be due to intense browsing, for example by molluscs.
by Mark Powell
Fri Apr 19, 2024 10:28 am
Forum: Lichens
Topic: Lichen on Little Asby limestone
Replies: 8
Views: 856

Re: Lichen on Little Asby limestone

I'm not going to provide a confirmed id at this stage but have you considered Aspicilia s. lat.? The ecology and apothecial pigmentation would fit, as would the fewer than 8 spores per ascus (in some species) and the rather large sub-spherical ascospores. Perhaps the biggest problem with my ...