Question

Spores of Riccia are liberated by

• A. Peristome teeth and seta.
• B. Shrinkage of annulus and explosion of capsule.
• C. Death and decay of thallus and external pressure on calyptra.
• D. Xerochasy of elaters.

Answer 1

The correct option is C Death and decay of thallus and external pressure on calyptra.

The sporogonium of Riccia never dehisces. The spores are liberated by the decay or shrivelling of the surrounding outer layer of the calyptra and thallus tissue. The thallus perishes in the dry season. The spores remain behind on the soil. In this condition, they may be dispersed by the wind.