Search found 20 matches

by peterbisset
Sat Apr 13, 2024 8:09 pm
Forum: Lichens
Topic: Phacographa zwackhii
Replies: 4
Views: 87

Re: Phacographa zwackhii

A frustrating afternoon, lucky it was raining outside. It took me 3 hours to find another fertile sample. I'm not convinced that it is all not P. zwackhii as the unstructured pigmented material, hyphae and odd photobiont cells look much the same as when there is a hymenium. If I hadn't chosen the ri...
by peterbisset
Sat Apr 13, 2024 2:53 pm
Forum: Lichens
Topic: Phacographa zwackhii
Replies: 4
Views: 87

Re: Phacographa zwackhii

Thanks, I deliberately dissected a nice round looking one from my sample so obviously got lucky! I'll have a look at a fleck to see what I can find.
by peterbisset
Fri Apr 12, 2024 7:58 pm
Forum: Lichens
Topic: Phacographa zwackhii
Replies: 4
Views: 87

Phacographa zwackhii

Phlyctis argena on an ash at NY7220 near Appleby Cumbria showed dark brown irregular spots with possibly darker margins apparently growing through and on the thallus. These peeled off easily and did not penetrate deep into the thallus they proved to be apothecia, asci 8 spored, not long and thin 2-3...
by peterbisset
Thu Apr 11, 2024 5:57 pm
Forum: Lichens
Topic: Caloplaca??
Replies: 2
Views: 84

Re: Caloplaca??

There was Protoblastenia in the graveyard but on calcareous stone and the thallus is usually very thin and scurfy although I see Dobson does say it can be areolate.
by peterbisset
Tue Apr 09, 2024 5:00 pm
Forum: Lichens
Topic: Caloplaca??
Replies: 2
Views: 84

Caloplaca??

Sandstone headstone in Milland churchyard SU8228 VC13 West Sussex (but very close to the Hampshire border). Circular thallus with apparently a black prothallus visible around the margin and between the areoles. Thick greeny-white thallus with an orange tinge in the centre. Areolate in the centre Tin...
by peterbisset
Tue Apr 02, 2024 7:33 am
Forum: Lichens
Topic: In the garden
Replies: 3
Views: 1630

Re: In the garden

Try Enchylium (Collema) tenax
by peterbisset
Mon Mar 25, 2024 8:02 pm
Forum: Lichens
Topic: sterile non-sorediate chocolate brown crust on siliceous gravestone
Replies: 0
Views: 1638

sterile non-sorediate chocolate brown crust on siliceous gravestone

Sterile extensive non-sorediate chocolate coloured, C-K-Pd-, crust composed of amalgamating smaller individuals with darker margins. Alga is Trentepholia. More extensive on the west facing side but colonising both vertical sides and the north facing edge of a fine grained sandstone headstone in a sh...
by peterbisset
Wed Mar 20, 2024 11:17 am
Forum: Lichens
Topic: Chaenotheca ferruginea chemistry
Replies: 2
Views: 851

Chaenotheca ferruginea chemistry

I found some patches looking a bit like C. ferruginea in a large sheet of Lecanactis abietina on old ash in the Eden Valley, Cumbria. The chemistry, C+ spectacular blood red in all parts and K+ equally spectacular crimson/purple in all parts looked Caloplaca-ish. There was a white thallus under the ...
by peterbisset
Wed Feb 21, 2024 12:06 pm
Forum: Lichens
Topic: Snowball lichen invading Arthonia thallus
Replies: 3
Views: 877

Re: Snowball lichen invading Arthonia thallus

I went back to have another look today, but it has rained in the night and accessing the tree risked a dangerous fall into the flooded river. There was Inoderma nearby, confirmed with C and K, and what looks like classic A. atra (attached). I always like a look at the spores to confirm an 'Opegrapha...
by peterbisset
Tue Feb 20, 2024 4:51 pm
Forum: Lichens
Topic: Snowball lichen invading Arthonia thallus
Replies: 3
Views: 877

Snowball lichen invading Arthonia thallus

Here we have what is probably Arthonia atra but could be another Opegrapha. There was typical A. atra with clustered lirellae forming mosaics nearby. The interesting thing are the patches of a white thallus without pycnidia but with snowballs, sporodochia? The only thing I could find similar was Tyl...
by peterbisset
Wed Feb 07, 2024 5:32 pm
Forum: Lichens
Topic: K+ blue reaction??
Replies: 6
Views: 449

Re: K+ blue reaction??

Hi Mark,
my first thought was of O.vermicellifera but not even finding any conidia it was back to the drawing board, I might have another go.
by peterbisset
Tue Feb 06, 2024 4:01 pm
Forum: Lichens
Topic: K+ blue reaction??
Replies: 6
Views: 449

Re: K+ blue reaction??

Just went and checked, 24 hours later the blue had faded but was still just visible under UV. I tried a more typical bit of Enterographa, greenish with apothecia and without the pustules, and got the K- but K/UV+ blue. Could the pustules be a pruina of confluentic acid so concentrated it is K+ blue ...