Cronisia and its two species, C-fimbriata and C-weddellii

The systematic position of Riccia fimbriata Nees, a species formerly known only in sterile condition and tentatively placed in the genus Exormotheca, is reexamined in the light of the recently discovered reproductive structur es. The species proved to be a member of the genus Cronisia, identical to C ronisia mexicana Hicks, described in 1993. A key is provided to the two kno wn species of Cronisia, C. fimbriata and C. weddellii, and they are describ ed and illustrated. (C) 2001 Adac/Editions scientifiques et medicales Elsev ier SAS.