The germination of the megaspores is started in the sporangium; at a certain point in their development they are shed.
A distinctive feature is the incomplete annulus of the sporangium.
Stipe present or often wanting, seldom prolonged within the sporangium as a columella.
Associated with the spores in the sporangium occurs the capillitium.
The manner in which the spores originate in the sporangium calls for comment.
The dark red granules of the sporangium walls are abundant and appear to form a continuous crust.
The sporangium is quite a large affair, easily discerned with the naked eye.
The cysts, then, belong morphologically to the peridium or sporangium wall.
Stipe very short, black, sometimes reduced to merely a blackish base to the sporangium.
The stipe is very short, and the columella runs as a straight, gradually diminishing axis to the very apex of the sporangium.
sporangium spo·ran·gi·um (spə-rān'jē-əm)
n. pl. spo·ran·gi·a (-jē-ə)
A cell within a fungus in which asexual spores are produced by progressive cleavage.