Floristische notities 80—85

This series of “Floristische notities” contains the following notes: 80. Osmunda regalis L., known from the Dutch Frisian Islands Terschelling and Schiermonnikoog, also occurs on the island of Texel. 81. First record of Asplenium adiantum-nigrum L. for the Dutch Frisian Islands. 82. New localities of Cerastium holosteoides Fr. subsp. holosteoides and subsp. pseudoholosteoides Möschl in the tidal area of our large rivers. 83. New localities of Crambe maritima L. along the Dutch coast. 84. Moneses uniflora (L.) A. Gray, formerly known from Appelscha, prov. Friesland (1849) and Denekamp, prov. Overijssel (1906) was found in 1969 on the island of Terschelling. 85. The unexpected occurrence of Blackstonia perfoliata subsp. serotina (Koch) Vollm. near Buren (prov. Gelderland) appears to be caused by sowing for experimental purposes.