Dianema depressum (Lister) Lister

Fructification
varying from flattened to, rarely, hemispherical plasmodiocarps, up to ca. 9 x 13 mm and 0.3-0.7(-1) mm high. The surface often with traces of the plasmodial veins, which formed the fruitbody. The colour in RL varies from light olive-brown to almost chocholate-brown. Often with a shiny surface.

Peridium
membranaceous but mostly rather robust, occasionally wrinkled or with thickened, darker veins. In TL pale olivaceous yellow to olive-brown. On the inner side with a more or less distinct net-ornamentation of fine lines, meshes 1-3(-9) µm.

Capillitium
of 0.5-1 µm thick, solid threads fixed at the peridium above and at the hypothallus below. The threads are sparsely branched and run ± parallel. With a finely warted surface. Olivaceous yellow in TL.

Spores
spherical, rarely shortly ellipsoid, same colour as the fruitbody, pale greyish yellow in TL. Approx. 2/3 to 3/4 of the surface covered with a net-ornamentation, much like the one of the peridium, formed of ca. 0.5 µm high lists, ca. 8-12 meshes across a diameter. 6.2-7.0-8.2 µm Ø.

Ecology
Rotten wood of deciduous trees, among others willow (Salix sp.) and alder (Alnus glutinosa), mostely watersoaked.

Distribution in Denmark
Only half a dozen finds in Danmark.

Global distribution
Scattered throughout Europe, Israel, Japan, Australia and western USA.

 


Abbreviations: TL : transmitted light; RL : reflected light; Ø : diameter; TBU : Danish Botanical Topographical District.

Colour-codes refer to: Kornerup, A. & J. H. Wanscher 1974: Farver i farver. 5th reprint. Politikens Forlag, Copenhagen.

When not otherwise indicated spore measurements are given as: min-mean-max or (extreme-)min-mean-max(-extreme). Spore measurements are exclusive of ornamentation.

Line drawings are free hand sketches.

Distribution maps: Maps of Danish distributions are based on material seen by the author. World distributions are based on reports extracted from literature.