Question

The peristome in Funaria consists of at maturity

• A. One series of curved narrow triangular teeth, 16 in number
• B. One series of curved narrow triangular teeth, 32 in number
• C. Two series of curved narrow triangular teeth, 8 teeth in each
• D. Two series of curved narrow triangular teeth, 16 teeth in each

Answer 1

The correct option is D Two series of curved narrow triangular teeth, 16 teeth in each

The peristome, which lies immediately below the operculum consists of two sets of long, conical teeth, one within the other. The teeth of both the sets are on the same radii and thus opposite to each other. The tapering distal ends of the teeth of the outer set converge towards each other and are united terminally in a small central disc of tissue. The peristomial teeth are sculptured structures, that close the opening of the spore sac. They are attached at the base of the rim or diaphragm. The outer set of the peristomial teeth are hygroscopic and respond to the changes in humidity. The presence of peristomial teeth guarding the mouth of the theca region slows the rate of spore discharge.