130 



direction of the frond so loosely connected, that they after decalci- 

 fying are easily sepårated by pressure. 



With reference to colour it also appears to be subject to much 

 variation. Crouan quotes the colour in f. depressa to be „rosée". 

 The named fragments that I have seen are much faded, partly,. 

 however, with a faint purplish tinge. The specimen from Dr. 

 Bornet's collection with tetrasporic sporangia (pl. 18, fig. 10) is 

 yellowish-brown and partly with a purplish tinge. Another speci- 

 men from Cherbourg is feebly wine-coloured. Solms Laubach 

 remarks 1. c, that the colour „schwankt zwischen trubroth und 

 bråunlichviolet ; an iippig wachsenden Exemplaren ist seine Ober- 

 flåche blåulich bereift". In f. Harvey i the colour of living speci- 

 mens is according to Mr. B at ters „a purplish pink very much 

 like that of L. polymorpJium but fainter and more fugitive". Dried 

 specimens of both forms often closely resemble each other in colour. 



Remark on the synonomy. Besides the above mentioned sy- 

 nonymes is to be remarked, that L. polymorphum Cm. no doubt 

 also belongs to the present species and stands nearest to f. Harvey u 

 I have seen three authentic but fragmentary specimens, which are 

 up to 1 cm. in thickness, with rather coarse and irregular processes. 

 The conceptacles of sporangia accord with those of the present 

 species, and the sporangia are tetrasporic, of about the same size: 

 as the above quoted smaller ones in f. Harveyi. 



So also with regard to L. polymorphum Le Jol, of which 

 I have seen a smaller specimen (Herb. Le Jol. No. 1745). It is 

 about 1 mm. thick, confluent crusts«form ridges, but otherwise 

 being nearly even and smooth, with conceptacles of sporangia and 

 cystocarps in development, and most probably identic with f. de- 

 pressa. In an overgrown conceptacle I found tetrasporic sporangia. 

 Whether it, however, is identic with the form distributed in Alg. 

 mar. Cherb. No. 11 is unknown to me. 



As mentioned under L. fruticulosum and L. crassum John- 

 stoiVs Null. polymorpha probably includes both these species as 

 well as the present. Thus pl. 25, fig. 2—3 1. c. represent forms, 

 that seem to be most nearly related to f. Harveyi, the one, fig. 2„ 

 however, perhaps being a form of L. crassum. 



