I have written many posts about it. (Old posts first, newer ones at the end).
In 2018 I made a poster display on the topic for the Yorkshire Naturalists' Union Conference - It had by then changed name to Hormidiopsis crenulata (Kuetz.) Heering and was formely known as Hormidium.
Allan used the English name "Nuisance alga" - because is growing over lichens. It is spreading because there are so many nitrogen compounds in the air from intensive factory farming.
These inserted notes in red were added on July 2025
Apatococcus ammoniophilus -
Apatococcus ammooniophilus is its new name.
I learned this in our BLS Lichen Chat and Improvement group in July 2025. One of the participants (Julie Hilligsøe Lisby) told us about a Danish scientific paper describing its new name, by Søchting et al.... and including a picture of how it was interrupting the Danish Christmas Tree industry by growing over conifers.
In Denmark they call it
Gylletråd - which translates as Slurry Wire (though I would give it the name it Green Velvet or Green Blotting-paper Lichen myself)https://gylletraad.dk/en/front-page/ Computer generated translations of this site seem to give other translations such as "Gold thread" and wire mesh"
In 2018 I made a poster display on the topic for the Yorkshire Naturalists' Union Conference - It had by then changed name to Hormidiopsis crenulata (Kuetz.) Heering and was formely known as Hormidium.
Allan used the English name "Nuisance alga" - because is growing over lichens. It is spreading because there are so many nitrogen compounds in the air from intensive factory farming.
Read link 1 below first. (And see diagrams about nitrogen deposition at the foot of this page)
- Sept 2013 - READ THIS FIRST - it explains a lot.
- March 2012
- Klebsormidium crenulatum - filamentous green alga on CCG walk to Ryeloaf Hill Aug 2012
- Feb 2013
- YNU Bryophytes visit to Ponden on W Yorks /Lancs border - The mosses of Heathcliff and Catherine
- Lichens at Horton in Ribblesdale Churchyard 15 Oct 2014
- Rombald's Moor/Skipton Moor on Forest Church Walk 23 Oct 2014
- Klebsormidium near Langcliffe Lochs 26 Oct 2014
- Klebsormidium near Sannet Hall, 18 Nov 2014 It really is dire here.
- Lofthouse - Nidderdale Lichens 13 Oct 2017
- Klebsormidium on grit wall near Giggleswick School - Oct 2017
- Klebsormidium on fence-posts above Pen-y-ghent Gill
- Klebsormidium at Ribblehead Station Dec 2017
Diagrams below: Left NITROGEN DEPOSITION;
Right: AMMONIA CONCENTRATION
Right: AMMONIA CONCENTRATION
I especially notice it on siliceous rocks high in the hills of the Pennines, sometimes quite a long way from the nearest farm house and cattle shed or slurry pit. I feel that the Klebsormidium / Apatococcus grows because of Nitrogen Deposition (e.g. due to heavy mists and rainfall in the mountains) - rather than just ammonia concentration.. But then I don't live next to a chicken farm - It is likely due to a combination of both.
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