Arcyria major (G. Lister) Ing

Fructification
sporokarps in groups, which may be up to 4.5 x 2 cm across, cylindrical, 2-2.5 mm high and ca. 0.5 mm broad, almost sessile til short stipitate, brick red (8D7 til 9D7), fading to greyish brown.

Stalk
rather short, up to ca. 0.4 mm, longitudinally furrowed, greyish to reddish brown to almost black, in transmitted light reddish brown, occasionally filled with indistinct spore-like cells.

Peridium
early evanescent, leaving a small flattened cup, very pale yellowish in transmitted light, on the inside with ± regularly distributed warts, which may be interconnected by faint lines.

Capillitium
forming a net of thin tubules, 2-3 µm in diam., ornamentation exclusively of regular transversal rings and half-rings, attached to the inner side of the cup, pale greyish yellow in transmitted light, at maturity the net expands into an up to 8 mm long lax plume.

Spores
spherical, concolourous with sporocarp, pale yellowish in transmitted light, almost smooth with scattered groups of warts, 7.2-8.3-0.0 µm in diam.

Ecology
Rotten wood of deciduous trees.

Distribution in Denmark
Rare. Only few collections known.

Global distribution
Known from Europe, Central Africa, Ceylon, China, Eastern USA og Brasil.

Discussion
Arcyria major is a species difficult to delimit precisely. From the other red species of Arcyria it is best recognized by the long, cylidrical capllitium of thin tubules with a remarkbly regular ornamentation of rings and half-rings. From A. affinis it can be segregated by the attachment of the capillitium on the inner side of the calyculus.

Discription
Description and discussion based on Albertsen & Gøtzsche (1993).