INOPERCULATE DISCOMYCETES : ascus unitunicate and inoperculate. three orders: Helotiales; Phacidiales; Ostropales.

• Phacidiales. Apothecia single or in a stroma; ascocarp with black walls, often the ascocarp is called a hysterothecium. Ascus inoperculate, unitunicate, and inamyloid.
  • Rhytismataceae: composed of numerous separate stromas; Rhytisma. causes tar-spot of maples.

hymenial areas of the ascoma are opened in the leaf on right
Rhytisma

Hypodermataceae. ascocarp a hysterothecium.

Hypoderma. (no illustration) Hysterothecia found on the ovuliferous scales of the cones of spruce.(no illustrations)

Lophodermium. causes needle cast of conifers;

hysterothecia of different ages on needles ;ascospores scolecosporus in a bitunicate ascus

classification system (places icons into orders)

index to genera/species