Flat corner disc

Flat corner disc
	Flat corner disc ( Diatrype stigma )
Systematics
Class :	Sordariomycetes
Subclass :	Xylariomycetidae
Order :	Xylariales (Xylariales)
Family :	Corner disc relatives (Diatrypaceae)
Genre :	Corner discs ( diatrype )
Type :	Flat corner disc
Scientific name
	Diatrype stigma
	( Hoffm .: Fr. ) Fr.

The flat or pitted corner disc ( Diatrype stigma ) is a very common fungus from the family of the corner disc relatives (Diatrypaceae). The extensive crusts ( stromata ) formed by the fungus are characteristic.

features

The flat corner disc develops extensive crusts on the colonized substrate, which are about one millimeter thick. They are formed under the bark and will peel off over time. The mushroom is black-brown to black in color and has a finely dotted surface due to the perithecia mouths . Sometimes it also appears pitted; with age it develops numerous cracks.

The spores are pale brown in color, allantoid (sausage-shaped) and smooth; they measure 6.5–11 x 1.5–2 micrometers. The asci are cylindrical-club-shaped and have a long stem. They are 30 to 50 micrometers long and four to six micrometers wide.

Species delimitation

The flat corner disc can hardly be confused with a little experience. Within the genus Diatrype it is characterized by the flat stroma. Species of the genus Eutypa can show a certain similarity . However, these form fruit bodies sunk into the substrate. Some species of the genus Hypoxylon also grow like crusts. However, these have black and larger spores.

ecology

The flat corner disc is a very common fungus. It can be found all year round on dead branches of various deciduous trees such as birch , maple or bird cherry , but also on oak and beech . The stroma often cover up to half of the larger branches. In the spring they are fully mature.

swell

literature

Ewald Gerhardt: FSVO manual mushrooms . BLV, Munich 2006, ISBN 3-8354-0053-3 .

Individual evidence

↑ Hans E. Laux, Andreas Gminder : The great cosmos mushroom guide. All edible mushrooms with their poisonous doppelgangers. Franckh-Kosmos, Stuttgart 2010, ISBN 978-3-440-12408-6 .

Web links

Commons : flat corner disc ( Diatrype stigma ) - collection of images, videos and audio files

[1] Hans E. Laux, Andreas Gminder : The great cosmos mushroom guide. All edible mushrooms with their poisonous doppelgangers. Franckh-Kosmos, Stuttgart 2010, ISBN 978-3-440-12408-6 .