Sematophyllum substrumulosum (Musci, Sematophyllaceae), new for the Belgian
flora. - Sematophyllum substrumulosum was found in 1998 as an epiphyte on
a willow in Kapellen (province of Antwerp), near the Dutch border, the firs
t record for the species in Belgium. This mediterranean and Macaronesian sp
ecies occurs as far north as the southwest of France and was recently disco
vered in western England. The plant is described and illustrated and is pro
ved to be very similar to specimens from southern Europe. Its ecology, as w
ell as the differences with other members of the genus, with Rhynchostegium
confertum and Hypnum spec, are outlined. A distribution map is given for E
urope and Macaronesia. It is concluded that the species is not an introduct
ion, but that it may have been neglected.