Tuesday, 18 November 2014

Ctenidium query

The main bryos here are Ceratodon purpureus, Fissidens
adianthoides, Pseudoscleropodium purum, 
Barbula convoluta
var. convoluta, Trichostomum crispulum, Didymodon fallax, 

& Encalypta streptocarpa
My adventures today involved walking Alfie for 20 minutes over a slag tip at Mynydd Lliw (30m asl!) SN597007, which is less than 2km from the house, this being an area that I'd already looked at last year. I did manage to add an extra six species to SN50V taking it to 82 species, one of which was Ctenidium molluscum. I have been logging my records of this species as var. molluscum based on this being the default, but in reality I don't look for the other var's. In order that we all record consistently I thought I'd raise this issue which also relates to a number of other taxa. Perhaps we can deal with them individually or as a list. In the case of Ctenidium molluscum I'm inclined to simply record it as the binomial unless there's a good reason to do otherwise?


  1. Given all the calcicoles, perhaps I'd better check the Ceratodon more closely!, although the patches were fairly discreet.

  2. I did wonder about the Ceratodon Barry, though with slag tips I'm sure you get some unlikely bedfellows.

    As you say, there are a few inconsistencies in the way we've recorded (in MapMate) some of the species with a number of vars, e.g. A. serpens, Zygodon spp. It would be good to standardise this to save later editing.

  3. I agree we need a consistent approach, especially because I believe that mass-edits are difficult on MapMate (they certainly were on Recorder, which is one reason I gave up on it). I would say that all Ctenidium in normal Ctenidium places - ie calcareous grassland, spoil etc is var molluscum; woodland specimens are troublesome because of "the woodland taxon" or var sylvaticum, which I still haven't understood perhaps because of typos in Smith ed 2; upland crag specimens are again troublesome because var condensatum seems distinct but it's hard to say why (again Smith ed 2 is hard to decipher). Var robustum seems distinctive but is very rare; var fastigiatum is rather more dubious. Basically record as var molluscum unless there's good reason to do otherwise.

    Would anyone like to volunteer a list of MapMate names that I can then advise us all on?!

  4. I'll set up a tab we can refine then use for reference