THE BOREAL-ALPINE BRYOPHYTE GRIMMIA ELONGATA KAULF STILL PRESENT AT WILLERZIE (BELGIUM) AFTER 132 YEARS

Grimmia elongata Kaulf., a boreal-alpine species, was collected in 1870 near Willerzie (Namur province) at 400 m a.s.l. by F. Gravet. Although new to Belgium, the species was not recognised and published as G. montana var. epilosa Gravet & Delogne, and successively as G. trichophylla var. epilosa (Gravet & Delogne) J. L. De Sloover. In 1983, the species was recollected near Willerzie by A. Sotiaux but not named. In 2002, Sotiaux identified his material as G. elongata. H. C. Greven confirmed the identification. During a joint visit to the locality, in Nov. 2002, they found the species still present on damp acidic rock in a gulley in woodland south of Willerzie close to the French border, its only known locality in Belgium.