synan's picture


Observed: 11th June 2012 By: synansynan is knowledgeable about Fungi and Lichenssynan’s earned reputation in Fungi and Lichenssynan’s earned reputation in Fungi and Lichenssynan’s earned reputation in Fungi and Lichenssynan’s earned reputation in Fungi and Lichenssynan’s earned reputation in Fungi and Lichens
Xanthoparmelia (2)
Xanthoparmelia (3)
Xanthoparmelia (4)
Xanthoparmelia (5)
Xanthoparmelia (6)

Different thalli on coastal rocks, so potentially different species, and I will split them if need be.
Not sure I can go beyond genus without thin layer chromatography. These don't key out in Dobson because they lack isidia and are infertile, a combination not allowed for. Smith et al. gets me to X. delisei, pulla or perrugata. In material from one thallus, the lower surface is black and under a stereomicroscope, the upper surface is strongly white-maculate.


Caution: Do NOT use iSpot to identify fungi to eat!

Some fungi are very poisonous so a mistaken ID could have serious consequences.

Species interactions

No interactions present.


AlanS's picture


I think that sums up this group pretty well.

I might hazard a guess that 1 is X. delisei, based on the well developed pseudocyphellae and strong transverse wrinkles, and 2,3, & 4 are X. pulla, slightly darker colour and smoother lobes, but it's no more than a guess. I think the thalli are well developed enough to have produced isidia if they had been so inclined.

Interestingly 3 has quite a nice little fungus, also visible in photo 4. This is likely to be Clypeococcum cladonema. It has been claimed for different Xanthoparmelia species at different times, but a current draft key to these things that I am not allowed to cite gives it only for X. pulla (but also on Cetrelia which suggests either it is not reliably host-specific or else someone needs to do some DNA work - I suspect the latter).

I wouldn't split the observation; I think it is instructive as it is.


synan's picture

Thank you

Yet again, a massive thank you for your comments.

I noticed that 3 was odd, and was considering it to be another (competing?) lichen, but since it looks so well integrated with the surrounding thallus, thought it might be an unusual character. Parasitism makes more sense. Thank you so much.


AlanS's picture

Well I am really pleased

to see the fungus.

Looking at it again, it looks exactly right for Clypeococcum cladonema. Each rounded black area has several just-visible pimples - i.e. several perithecia grouped together.

Taking note of the grid reference, not too far from somewhere else I want to go ....

You evidently had a successful few days, several good photographs. I imagine that the Teloschistes was was moderately pleasing.


synan's picture


I am sometimes pinpoint-accurate on location, but not quite here, although not far off. To retrace my route, I started at the lower car park near the information board, not the summit of Mynydd Mawr near the old coastguard station. I walked back along the road, past the campsite and ascended the obvious path up Mynydd y Gwyddel. It was then a semi-scramble down the rocky seaward side of the hill, where these thalli were found.

I also visited St Mary's Well at the foot of the cliffs, where Heterodermia leucomela has reputedly been sighted, but I didn't find it. I didn't get chance to look for Heterodermia japonica nearby at Pen y Cil - maybe next time.

Unfortunately, the sample I have isn't tormented by the fungus you mention. I will return for 1-3 weeks in July/August (yet to be decided), and will gladly try to relocate the thallus of interest and send material if you don't get there yourself.

Yes, it was a great few days despite the rain. Teloschistes flavicans was a highlight, and worth the considerable effort taken to find it.

Edit: I may have spoken too soon. One corner of my sample has black warts (images appended) that look like ascomata. Obviously, they might not be the same as those in pic 3, which look more sunken.


synan's picture

Nesolechia oxyspora

I revisited last week and managed to find material identical to that in photo 3. With simple, fusiform ascospores of 18-19 x 5-7µm, this seems to want to be Nesolechia oxyspora. Thought you might like to know.