In the following plants we find no perithecia in the ripe specimens, hence of course they will in time be considered a genus.
The perithecia are arranged in a circle neat the apex of the stroma.
The original, by Ehrenberg, represents them as hollow bodies, with the perithecia imbedded in the walls.
The walls of the perithecia are carbonous, and confluent with the crust.
The spherical bodies, or perithecia, were seated on a plentiful hyaline mycelium.
Our figure 856 shows a section, and the arrangement of the perithecia.
The perithecia are engendered where two filaments cross each other.
In Chætomium, the perithecia bristle with rigid, dark-coloured hairs, and the sporidia are coloured.
They have a solid carbonous interior with the perithecia imbedded near the surface.
Seated on the mycelium, at the first as little orange points, are the perithecia, which enlarge and become nearly black.