Asplenium obovatum Viv. subsp. lanceolatum (Fiori) Pinto da Silva dans les Vosges gréseuses

Abstract

Asplenium obovatum subsp. lanceolatum is a rare fern which is found only in the northern Vosges. It grows only on south-exposed sandstone rocks in humid woody sites. A slight decline of the species is stated on the stations which are detected by E . Walter at the beginning of this century.