Search found 31 matches

by Neil Sanderson
Thu Mar 21, 2019 9:39 am
Forum: Lichens
Topic: Chaenotheca: a Pd/UV Reaction & a Question
Replies: 0
Views: 32

Chaenotheca: a Pd/UV Reaction & a Question

I have another positive UV/Pd test, one that Mark was interested in, and a query on a Chaenotheca specimen. The positive UV/Pd test, was from Chaenotheca stemonea , collected from a leaning ancient Oak in Mallard Wood, New Forest. This species is supposed have a Pd + yellow thallus but the strength ...
by Neil Sanderson
Mon Mar 04, 2019 8:56 pm
Forum: Lichens
Topic: Help!
Replies: 3
Views: 205

Re: Help!

Nick Not sure I can say much about this, not sure it is a lichen at all, conceivably it is a Peltigera , but it sort of looks more like a non-lichenised fungus. In this case a habitat picture showing the whole organism would have helped. If it was a Peltigera, then a picture habitat showing the whol...
by Neil Sanderson
Sun Feb 24, 2019 9:36 am
Forum: Lichens
Topic: Porpidia?
Replies: 4
Views: 120

Re: Porpidia?

Chris

The new K/UV test would help as P. cinereoatra has confluentic acid and P. contraponenda does not. Just put some K on the thallus and shine a UV lamp at it. P. cinereoatra will produce a bright mauve fluorescence. You can test this on Enterographa zonata (Opegrapha zonata)

Neil
by Neil Sanderson
Fri Feb 22, 2019 6:55 pm
Forum: Lichens
Topic: Parmotrema on hazel
Replies: 3
Views: 118

Re: Parmotrema on hazel

Paul

I have got some odd glows from Parmotrema perlatum, so the KC + pink medulla would clinch it.

Neil
by Neil Sanderson
Fri Feb 15, 2019 7:01 pm
Forum: Lichens
Topic: Lichenised Fungus
Replies: 2
Views: 118

Re: Lichenised Fungus

Bob This is a Ramalina , with a strappy thallus, which is the same colour on both sides. The thallus is clearly hollow from breaks in the cortex in the upper picture. It is fertile (the cups) and there is no sign of soredia, so that gets us to Ramalina fastigiata . This is the second commonest Ramal...
by Neil Sanderson
Sun Feb 10, 2019 10:40 pm
Forum: Lichens
Topic: Athallia (Caloplaca) pyracea?
Replies: 5
Views: 149

Re: Athallia (Caloplaca) pyracea?

Juliet

Looks fine to me for Caloplaca pyracea, although I have not seen it much. Mark knows it much better.

I have attached a photo of a specimen from a White Poplar, collected in 2011, from North Hampshire

Neil
by Neil Sanderson
Sat Feb 09, 2019 7:41 am
Forum: Lichens
Topic: Phylloblastia
Replies: 7
Views: 194

Re: Phylloblastia

Fay I woundered if it was the same tree! I got the same taxa. I am putting it in as Phylloblastia bielczykiae , as this is not in the dictionary you need to paste it into the species column. It is useful to put in any “known unknowns” under a name like “ Roselliniella sp A” (a distinctive parasite o...
by Neil Sanderson
Fri Feb 08, 2019 9:51 pm
Forum: Lichens
Topic: Phylloblastia
Replies: 7
Views: 194

Re: Phylloblastia

Fay Well done. Phylloblastia fortuita has at most submuriform spores with 0–2 longitudinal septa, for which Alan Orange's British and Other Pyrenocarpous Lichens https://museum.wales/media/13849/Orange-A-2013-British-and-other-pyrenocarpous-lichens.pdf gives the measuremants (16–)20–39(–42) × (4–)5–...
by Neil Sanderson
Fri Feb 08, 2019 11:33 am
Forum: Lichens
Topic: Opegrapha atra
Replies: 12
Views: 291

Re: Opegrapha atra

Chris I have this paper on my computer and can send. Looking at the paper, it looks like Damien Ertz sequenced Taeniolella on Opegrapha/Arthonia atra from Belgium and confirmed it was Taeniolella punctata . If your material is Taeniolella punctata it is very young, as mature material forms black tuf...
by Neil Sanderson
Thu Feb 07, 2019 7:28 pm
Forum: Lichens
Topic: Opegrapha atra
Replies: 12
Views: 291

Re: Opegrapha atra

Well Opegrapha atra is bizarrely actually Arthonia atra , and not just that but in the core group of Arthonia s. str. with, if I remember correctly, Arthonia radiata ! Sometimes the parasites better reflect the natural classification than the old splits: Arthonia graphidicola now only parasitises on...
by Neil Sanderson
Wed Feb 06, 2019 3:54 pm
Forum: Lichens
Topic: Anisomeridium?
Replies: 3
Views: 130

Re: Anisomeridium?

Chris Keys out using the LGBI2 sterile corticolous key as an Opegrapha , which is what I would have thought from the pictures. Ends at the couplet: Conidia 5-8 × 1-2 μm; thallus dull olive to red-brown .................................. Opegrapha rufescens Conidia of two types: 4-7 × 1-1.5 μm or 7-9...
by Neil Sanderson
Tue Feb 05, 2019 5:26 pm
Forum: Lichens
Topic: Cladonia macilenta or polydactyla
Replies: 3
Views: 122

Re: Cladonia macilenta or polydactyla

Christine Those are very small young podetia, so the best response is to find some nearby older ones! To answer some of your questions, I would say Cladonia polydactyla is very variable but Cladonia macilenta not so much (and the later is not closely related to Cladonia polydactyla , but is close to...