LeFrullania dilatata(L.) Dum. var.anomalaCorb. du Pas-de-Calais et le déroulement du lobule foliaire chez lesFrullania

Abstract

SUMMARYIn 1894 Frullania riparia Hampe (sub nom. Fr. aeololis Nees) was recorded in the north of France. This locality is reported in many bryological works, and among others in K. MULLER, Die Lebermoose Europas, 3 ed., 1253 (1957). A revision of the original material (in the Cryptogamic Herbarium, National Museum, Paris) shows that it was confused with Frullania dilalata var. anomala Corb. (1889), and that the only known locality of Fr. riparia in France lies in the eastern Pyrenees. The morphological and ecological differences between the two taxa are sought and the value of the var. anomala is discussed. The latter seems to be only the result of an accommodation to extreme moist state and would be an « ecad » (sensu CLEMENTS). There are parallel forms with evolute lobuli in several species of Frullania, for example Fr. tamarisci var. heterophylla and var. atlantica, Fr. germana var. explanata. In other species (Fr. riparia, Fr. inflata…), the unrolled lobuli have perhaps an evolutive signification and ...