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Orbilia rubrovacuolata - new host
Chris Yeates,
05-09-2020 16:44
Bonjour tous
I recently made a collection of this species in excellent condition (with the anamorph), in a location 4km & 5.4 km distant from the other sites I know for it in this area (West Yorkshire, England). What is worth recording, I think, are the habitat details.
It was growing on the base of a dead Vaccinium myrtillus stem, amongst moss, by a trackside on acidic Carboniferous Millstone grit. The site is very exposed to northern winds with views extending nearly 20 km. The altitude is 310 metres above sea level; in his recent monograph Zotto mentions 268 m.a.s.l. for Western Europe. Also in the extensive list of host substrates for Orbilia as far as I can see Vaccinium is not mentioned.
Cordialement, Chris.
Hans-Otto Baral,
05-09-2020 20:49
Re : Orbilia rubrovacuolata - new host
Seems o.k., though would be good to see free spores. Also the conidium does not really fit, too wide and only 2 septa.
I assume it has short glassy processes at the margin?
Indeed, Vaccinium is unreported so far for true Orbiliomycetes. Altitude is given as 2-268 m, but in Spain 7-512 m.
Chris Yeates,
05-09-2020 22:56
Re : Orbilia rubrovacuolata - new host
Hi Zotto
Some of the conidia illustrated in the monograph are depicted (and described) as 2-septate; also it looks wider than it was because of foreshortening (Verkürzung) & stacking.
Anyway here are better images of spores inside asci - also I managed to find a few outside the asci. And I assume this what is meant by "glassy processes" in marginal cells?
I only mentioned the altitude because Spain has much higher peaks (Variscan orogeny?) than the UK - 3700 m.a.s.l for Spain against 1344 for the UK (Scotland) and this collection would be the furthest north currently known. It was interesting to come across conidia of Endophragmiella boothii again - I must have seen them in half my collections of this Orbilia, and here in a non-woodland habitat.
LG, Chris
Hans-Otto Baral,
06-09-2020 10:15
Re : Orbilia rubrovacuolata - new host
Yes, Endophragmiella boothii is 3x noted as associated with this Orbilia. You are right with rarely 2-septate conidia, but did you measure your conidium? Yours could be 40 x 20 whereas O. rubro did not exceed 13.3 µm. The perspective is oblique indeed, making it looking shorter.
Indeed, 300 m in middle England might correspond to 500 m or more in Spain.