The Moss <i>Physcomitrella patens</i>, Now and Then

Abstract

Mosses (Musci, Bryophytaea) are one of the oldest groups of land plants present among the earth's flora. They originated 500 million years ago (for a recent discussion of the time scale involved, see [Heckman et al., 2001][1]) and are currently represented by approximately 10,000 species that