Observation 194527: Fuligo septica var. flava (Pers.) Morgan
When: 2014-09-05
(46.3597° 13.7012° 600m)

Notes: Code: Bot_832/2014_DSC3621

Habitat: mixed wood, Fagus sylvatica and Picea abies dominant, moderately southeast inclined mountain slope, shallow, skeletal calcareous ground, old overgrown slope and moraine scree with larger rocks and boulders, in shade, relatively warm place, partly protected from direct rain by tree canopies, average precipitation ~ 3.000 mm/year, average temperature 7 – 9 deg C, elevation 600 m (1.970 feet), alpine phytogeographical region.

Substratum: debarked trunk of Picea abies lying on ground in its late disintegration stage.

Place: Lower Trenta valley, between villages Soča and Trenta, next to the trail from Trenta 2b cottage to abandoned farmhouse ‘Strgulc’, East Julian Alps, Posočje, Slovenia EC.

Comment: Fuligo septica is probably the most common and widely known Myxomicete. The latest monograph on Myxomycetes I have (Ref.:1) describes six varieties of this species, which differ mostly in cortex structure (single versus double layered) and color of different parts of sporocarp and plasmodium. Fuligo septica var. flava should have vivid yellow aethalia, yellow inner lime and yellow plasmodium. Two days before I took these pictures I had seen the plasmodium, which was in a form of vividly yellow colored patch of densely packed small half-spheres. The rest of traits of Fuligo septica var. flava also fit well to my observation.

Nikon D70/Nikon D700/Nikkor Micro 105mm/f2.8

Species Lists

Images

495116
Aethalium surrounded by white hypothallus.
495115
Sporocarp – Aethalium.
495117
Sporocarp – Aethalium.
495118
Sporocarp – Aethalium.
495119
Aethalium cross-section.
495120
Spores.
495121
Measured spore dimensions compared to data from literature.
495124
Calcareous granules among spores.
495125
Yellow inner walls of aethalium and spore mass.
495126
Capillitial threads with spindle-shaped lime nodes.

Proposed Names

85% (1)
Eye3 Eyes3
Recognized by sight: Bright yellow aetalium and plasmodium.
Used references: (1) M. Poulain, M. Meyer, J. Borronet, Les Myxomycetes, FMBDS (2011), Vol.1: p390, Vol.2: p 169.
(2) B. Ing, The Myxomycetes of Britain and Ireland, The Richmond Publ. Co.Ltd, (1999), p 246.
(3) S.L.Stephenson and H.Stempen, Myxomycetes, Timber Press Inc.(2000), p 123.
Based on microscopic features: Spores minutely warty, globose to subglobose. Dimensions: 8 [8,4 ; 8,7] 9,1 × 7,4 [8 ; 8,2] 8,7 microns; Q = [1 ; 1,07] 1,1; N = 25; C = 95%; Me = 8,5 × 8,1 microns; Qe = 1,1. Olympus CH20, NEA 100x/1.25, magnification 1.000 x, oil (spores), NEA 40x/0.65, magnification 400x (capillitium, calcareous granules); in water; live material. AmScope MA500 digital camera.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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By: Matt Welter (mattfungus)
2015-08-08 11:21:32 PDT (-0700)

Created: 2014-12-23 11:07:34 PST (-0800)
Last modified: 2014-12-23 11:14:40 PST (-0800)
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