OF THE ORDER ALG^. 
217 
Lyngbye, in addition to the above Agardhian species, 
has described, under his genus Bangia, one decided Gloio- 
nema, viz. B. rutilans {Conferva rutilcms of Roth. Cat, 
Bot. ill. p. 179.) His B. quadripundata, if not truly Gloio- 
nema Jbetidum^ of which he is himself doubtful, also belongs 
tp Agardh's genus, and perhaps also his B. micans, but 
of this I cannot speak with equal certainty. 
The genus Bangia, if made to include those plants only 
which have the internal granules disposed in the form of 
transverse striae, would be a very excellent one, and would 
comprehend all the species it has at present, excepting those 
I have named as belonging properly to Gloionema; it 
would be composed of B. crista, laminaria,fusco-purpurea^ 
atrovirens, and mamillosa, all of which have a distinct and 
common character. 
B. laminaria has been detected in Scotland by Mr 
^KNOTT. 
1. Tuft of plants natural size. 
% Plants magnified. 
8. Summit of a branch of do. 
4. Granules. 
Fig. II. EcMnella circularis. 
1. Plants magnified. 
5. Do. very highly magnified. 
Edinburgh, "i 
Eocplanation of Plate VIII, 
Fig. I. Gloionema apiculatum. 
