Ginny B's picture

Thalidium sp

Observed: 25th May 2012 By: Ginny B
S159 Neighbourhood Nature - course complete
Ginny B’s reputation in Fungi and LichensGinny B’s reputation in Fungi and LichensGinny B’s reputation in Fungi and Lichens
Thalidium sp

White crustose lichen with quite large black pimples.


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

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

  • Thalidium papalare
    Confidence: It might be this.
    Likely ID
    Porpidia sp.
    Confidence: It's likely to be this, but I can't be certain.
Species interactions

No interactions present.


synan's picture

Thelidium papulare

The black discs here seem to have a proper margin, making them apothecia. Thelidium papulare (note the correct spelling) has dome-like perithecia with an opening (ostiole) at the top, visible here:

This might be a Porpidia sp., but a look at the spores under a microscope is probably necessary.


Ginny B's picture

Thanks, Nigel

Thanks, Nigel - correct spelling noted!

The perithecia was certainly very dome-like. I wasn't aware of an ostiole on the top but will have another look.

I don't own a microscope more's the pity, the best I can do is a magnifying glass, but that's probably not enough.


AlanS's picture

I agree

I agree with Nigel that this is most likely a Porpidia species, but most need microscopic examination and chemical testing.

Pretty good lichenologists confidently name many of them in the field. Very good lichenologists don't!

Since I am not a very good lichenologist yet (and a long way to go), I'll suggest this is Porpidia macrocarpa, but this is merely a suggestion.