Observation 174592: Stemonitis flavogenita E.Jahn

Code: Bot_823/2014_DSC2764

Habitat: old partly overgrown pasture, near mixed wood edge, moderately southeast inclined foot of a mountain; open, dry, sunny place; shallow, skeletal, calcareous ground, exposed to direct rain, average precipitations ~ 3.000 mm/year, average temperature 7-9 deg C, elevation 630 m (2.070 feet), alpine phytogeographical region.

Substratum: north side of a stump of Picea abies (on decorticated part) cut down three years ago.

Place: Lower Trenta valley, between villages Soča and Trenta, upper part of ‘Na melu’ place, East Julian Alps, Posočje, Slovenia EC

Comment: Highly distinctive traits of Stemonitis flavogenita are typically zig-zag bent columella with a kind of plate at the end just before the end of sporangia (Ref.:1). It is not gradually tapering toward the end of sporocarp as with other species of genus Stemonitis. It is also distinguished by the presence of membranous expansions in the capillitium. Also agreement of macroscopic properties fit well to literature, so I hope the determination is correct. This observation may be interesting since this species is listed neither in Boletus Informaticus data base, Mycotheca and lichen herbarium (LJU-Li) of Slovenian Forestry Institute nor in official Slovenian fungi checklist.

Sporocarp color rusty, oac719; spores on mass chocolate brown, oac635. Stalks 2.5 to 3 mm long, total length of sporangia 9 mm, all of them were fairly the same length, very closely tufted, their tips blunt. The whole clump had 14 mm in diameter.

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

Species Lists


Typical plates at the end of columellae can be seen also without microscopy at the ends of damaged sporangia (marked by arrows).
The average diameter of finely warty spores is slightly bigger than the average from the literature.
The average diameter of finely warty spores is slightly bigger than the average from the literature.
Capillitium is a loose network of threads with many expansions. The peridial network of sporangia is very fragile and was probably damaged. Thus it is not seen in the picture.
Membranous expansions in the capillitium (black arrows) and a single spore still attached to the capillitium (red arrow).
Zig-zag bending of the columella near and the small plate at its end. Capillitium is damaged and misplaced.
Hypothallus at the base of the stalk of sporocarp.

Proposed Names

57% (1)
Eye3 Eyes3
Recognized by sight
Used references: (1) B. Ing, The Myxomycetes of Britain and Ireland,The Richmond Publ. Co.Ltd, (1999), p 199.
(2) S.L.Stephenson and H.Stempen, Myxomycetes, Timber Press Inc.(2000), p 153.
(3) http://www.discoverlife.org/...
(4) http://www.myxomycetes.wolf-5.cyberdusk.pl/...
(6) http://www.myxomycetes.net/index.php
(7) http://myxo.be/...
(8) https://www.bookiejar.com/...
(9) https://www.shitennoji.ac.jp/...
Based on microscopic features: Spores finely warted, globose. Dimensions: 8,4 [8,8 ; 9] 9,5 × 8,2 [8,6 ; 8,7] 9,1 microns; Q = 1 [1,0] 1,1; N = 32; C = 95%; Me = 8,9 × 8,7 microns; Qe = 1. Olympus CH20, NEA 100x/1.25, magnification 1.000 x, oil (spores), NEA 10x/0.25, magnification 100x (all other pictures); in water. AmScope MA500 digital camera.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: amadej trnkoczy (amadej)
2014-08-20 11:55:38 CDT (-0500)

Thanks for your compliment, Danny.

thank you, as always, amadej
By: Danny Newman (myxomop)
2014-08-19 15:53:12 CDT (-0500)

for these so very inspiring observations

Created: 2014-08-19 14:36:09 CDT (-0500)
Last modified: 2014-08-19 14:36:29 CDT (-0500)
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