Search found 319 matches

by Chris Johnson
Wed Jan 23, 2019 5:59 pm
Forum: Lichens
Topic: Xanthoria
Replies: 9
Views: 88

Re: Xanthoria

Not sure what you have there, Mark, but it doesn't look right for Monodictys fuliginosa. The conidia are quite variable in size but do have a set form and are dark brown.
This is my ten-penneth: http://www.outerhebridesfungi.co.uk/species.php?id=448

Chris
by Chris Johnson
Wed Jan 23, 2019 3:42 pm
Forum: Lichens
Topic: Xanthoria
Replies: 9
Views: 88

Re: Xanthoria

I think Mark is right about Caloplaca (now Flavoplaca) marina. There is a very similar image on the FGBI site (which is misbehaving yet again) from the Isle of Muck. Looking back at the various images I have of this species, most of them have a black encrustation. Attached are three from Caloplaca ...
by Chris Johnson
Wed Jan 23, 2019 3:25 pm
Forum: Lichens
Topic: Xanthoria
Replies: 9
Views: 88

Re: Xanthoria

Thanks for another post Chris! I managed to access the FGBI link for Monodictys fuliginosa but as the hosts are given as Lobaria pulmonaria and Xanthoria parietina is the lichenicolous fungus something else as your specimen is a Caloplaca? Hi Jenny There is no doubt regarding Monodictys fuliginosa ...
by Chris Johnson
Wed Jan 23, 2019 3:21 pm
Forum: Lichens
Topic: Xanthoria
Replies: 9
Views: 88

Re: Xanthoria

I think those ascospores are fine for Caloplaca . They are septate, with a broad septum. If you are looking at images in books, bear in mind that the published images will be of 'cleared' spores. Your micrograph shows spores that appear to be fresh and mounted in water and hence the cell contents p...
by Chris Johnson
Wed Jan 23, 2019 9:25 am
Forum: Lichens
Topic: Xanthoria
Replies: 9
Views: 88

Xanthoria

The last of the pebbles. Collected from the upper and middle tidal zones, growing with Hydropunctaria maura . On first sight I thought Caloplaca with its scant thallus, but the spores said otherwise. On closer examination it became clear that the thallus had been serious erroded by the lichenicolous...
by Chris Johnson
Mon Jan 21, 2019 7:57 pm
Forum: Fungi on miscellaneous substrates (not soil or wood)
Topic: Penicillium?
Replies: 2
Views: 31

Re: Penicillium?

Hi Chris Sorry, not much help Chris ... but always erudite and often amusing .... I should have time to post on AscoFrance tomorrow. The lady in question does a tremendous amount of work on washed-up corpses of cetaceans so when she mentioned this 'growth' on ambergris, I was quite excited. Then I ...
by Chris Johnson
Mon Jan 21, 2019 2:23 pm
Forum: Fungi on miscellaneous substrates (not soil or wood)
Topic: Penicillium?
Replies: 2
Views: 31

Penicillium?

This was 'generously' given to me by someone working on beached cetaceans. It was growing on ambergris, removed from a Cuvier's beaked whale' skeleton. It had quite a depth of mould when I received it. I know longer have it, by the way, as it stank! Conidia: 5.3-8.9 x 3.6-5.6 µm The final image in C...
by Chris Johnson
Mon Jan 21, 2019 8:32 am
Forum: Lichens
Topic: A new lichen for GBI?
Replies: 12
Views: 220

Re: A new lichen for GBI?

Welcome to the forum, Maxine. Look forward to your posts.

Regards, Chris
by Chris Johnson
Sun Jan 20, 2019 4:46 pm
Forum: Lichens
Topic: Coastal Crustose
Replies: 2
Views: 29

Re: Coastal Crustose

Hi Paul This is me getting my eye in ... who said I was short sighted? DSC_3918.jpg A. smaragdula was a good call. Both C and K were negative but Pd was positive, yellow. Smith, et al. note that K can, rarely, be negative. Also pleased to know about the spore fragmentation. Thanks again and regards,...
by Chris Johnson
Sun Jan 20, 2019 3:28 pm
Forum: Lichens
Topic: A new lichen for GBI?
Replies: 12
Views: 220

Re: A new lichen for GBI?

Thank you Mark for taking that much trouble, and to Paul for the download.
I tried ordering a copy from Italy but the e-mail is suspect.
Best wishes,
Chris
by Chris Johnson
Sun Jan 20, 2019 3:08 pm
Forum: Lichens
Topic: White Crustose Lichen
Replies: 6
Views: 63

Re: White Crustose Lichen

Definitely a lichen thallus, I'll do some tests on my next visit.

I hadn't considered Opegrapha as I thought the ascocarps were all lirellate.

With thanks, Chris
by Chris Johnson
Sun Jan 20, 2019 12:24 pm
Forum: Lichens
Topic: Coastal Crustose
Replies: 2
Views: 29

Coastal Crustose

On a siliceous pebble that was part of an Atlantic coastal defence revetement, above the slash-zone except for winter storms. Thallus superficial, a light rust colour. No spores found but thousands of conidia from a 'drop'. Size: 3.6-4.9 x 1.5-2.2 µm Not got close to this one so any pointers welcome...