Observation 154659: Arcyria obvelata (Oeder) Onsberg

Code: Bot_753/2013_DSC8059

Habitat: Overgrown former grassland; dominant trees Ailanthus altissima, Fraxinus ornus, Corylus avellana, Fagus sylvatica, Juglans regia, Tilia sp., Prunus domestica; next to an abandoned farmhouse; flat terrain, calcareous ground; full shade, quite humid and relatively warm place, partly protected from direct rain by tree canopies; average precipitation ~ 3.000 mm/year, average temperature 7-9 deg C, elevation 590 m (1.950 feet), alpine phytogeographical region.

Substratum: vertical surface of dead, still standing trunk of Juglans regia partly still in bark fully covered by a Polyporaceae, probably Inonotus sp.; about 1 m (three feet) above ground, northeast oriented surface of the trunk.

Place: Lower Trenta valley, between villages Soča and Trenta, near abandoned homestead ‘Koc’, Trenta 3, East Julian Alps, Posočje, Slovenia EC

Comment: Long, hanging and very shortly stipitate sporocarps distinguish this species from others in Myxomycetes genus Arcyria. Sporocarps 8 – 13 mm long, about 1 mm diameter, flexible. Stalk very short, hard to observe, almost sessile sporocarps; sporocarps ocher-yellow, oac848; SP abundant, ocher-yellow, oac 856.

Nikon D700/Nikkor Micro 105mm/f2.8

Species Lists



Proposed Names

96% (4)
Eye3 Eyes3
Recognized by sight: Long elastic ocher sporocarps.
Used references: (1) B. Ing, The Myxomycetes of Britain and Ireland, The Richmond Publ. Co.Ltd, (1999), p 113.
(2) http://www.bcrc.firdi.org.tw/...
(3) http//hiddenforest.co.nz/slime/family/arcyriaceae/arcyr03.htm
Based on microscopic features: Spores subglobose and almost smooth, scattered warts hardly visible with my equipment. Dimensions: 8.7 (SD = 0.3) x 8.3 (SD = 0,2) μ, Q = 1.05 (SD = 0.02), n = 30. Olympus CH20, NEA 100x/1.25, magnification 1.000 x, oil, (picture of spores and capillitium threads). Bausch & Lomb 4/0.10, magnification 40x, in water (picture of capillitium). AmScope MA500 digital camera.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
will be added
By: amadej trnkoczy (amadej)
2013-12-18 08:50:15 GMT (+0000)

Thank you Martin. Will make the picture you miss in short and add it to the observation.

Fantastic job, once again!
By: Martin Livezey (MLivezey)
2013-12-18 01:04:12 GMT (+0000)

Very nice. Being from the states, the only thing I could ask for would be some photos of the adjacent landscape. Thanks for a the great photos and description!

on Phellinus ferruginosus
By: amadej trnkoczy (amadej)
2013-12-17 20:42:37 GMT (+0000)

The substratum has proved to be Phellinus ferruginosus not Inonots sp.

Created: 2013-12-09 21:14:38 GMT (+0000)
Last modified: 2015-01-17 09:51:10 GMT (+0000)
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