183 



which I possess quite certain specimens is Berlevaag in East- 

 Finmarken. It is not with certainty known between here and 

 Nordland, where I met with it at Lodingen, local but prett} r plentiful, 

 and Kle en Le. quotes it to be common and abundant. Besides, 

 it has been gathered at Nesodden in the Christiania Fjord (Schreiner). 

 It probably is commonly dispersed especially along the southern 

 part of the coast. 1 ) 



Geogr. Distribution. The Bahusian coast of Sweden (Are- 

 schoug, and others); the western Baltic Sea (Reinke); Helgoland 

 (Sonder, Kuckuck); Britain (Batters, Holmes); the western 

 ■coast ofFrance (Lenormand, Crouan, Le Jolis); the Mediter- 

 ranean Sea (Bornet, Falkenberg, Solms-Laubach); the Adria- 

 tic Sea (Hauck); the Black Sea (Deckenbach); the Atlantic 

 coast of North America (Far lo w)? 



Lithothamnion squamulosum Fosl. mscr. 



L. fronde lamelliformi, crustacea, 4 — 7 mm. crassa, violaceo- 

 grisea, lamellis plus minnsve horizontalibus, in tubercula minuta 

 verrucæforma prominentibus. Tab. 19, fig. 24 — 26. 



Description of the spedes. The plant forms rather extended 

 crusts 4 — 7 mm. in thickness, loosely covering rocks or other 

 crustaceous Lithothamnia, as L. polymorphum. The crust is more 



*) After this was ready for the press I met with the typical form of L. Le- 

 normandi in considerable abundance on rocks in the lower part of the 

 litoral and upper part of the sublitoral region, descending to about 1 fathom, 

 at Ytteroen in the Trondhjem Fjord. Especially when growing on shady 

 perpendicular rocks, or else in the first named region quite covered with 

 Fucaceæ or other algæ it in a living and younger, though fertile, stage 

 frequently assumes a dark vinlet or now and then purplish violet colour, 

 older, however, getting lighter, lilac, with a more or less yellowish shade 

 or occasionally even greyish. On the other hand, if growing uncovered it 

 always becomes more or less light, frequently a rather feeble lilac, and if 

 exposed to the sun in the lower part of the litoral region it often gets very 

 light, older even quite white or yellowish white. Besides, in an older stage 

 the plant is not so closely adherent to the substratum as in a younger. 



At the same place I also found a specimen on a stone just below low- 

 water maik which stands nearest to f. sublævis, with the surface nearly 

 smooth, and the conceptacles of sporangia are nearly as flattened as in the 

 above mentioned spscimens of this form but more crowded. 



