ADDITIONAL NOTE ON PHYLLACTIDIUM. 371 
have examined, which shows the slightest approach to what he calls the 
variety soluta. 
Mr. Carruthers has also shown me a paper, by Dr. Pringsheim, in 
his * Jahrbücher,’ vol. vii., for 1860, in which he gives a monograph of 
the genus Bulbochete, desiit six species of the genus. He regards 
the two varieties of M. Brebisson as distinct species, and he gives most 
accurate and interesting figures of the development and the kind of 
fructification of the plant I described as Phydlactidium pulchellum, 
under the name of Bulbochete scutata, see t. 2, 3, and 4. He observes 
that PAyllactidium setigerum is the same as his Bulbochete scutata. 
may remark that I have not observed the hairs on the surface 
but only on the margin of the plants, but then I have only been able 
to examine them very imperfectly. 
The plant received from Manchester, and which I have grown and 
observed its development, is certainly the Coleochete scutata of Ralfs 
and Pringsheim. It agrees in all the particulars which I have ob- 
served with the figures of the latter author, the Phyllactidium pul- 
chellum of Suringar, and with the dry specimen of the plant under 
this name in the collection of German Algz of Rabenhorst. It is 
most probably the Bulbochete scutata of Brebisson, figured in the ori- 
ginal paper in the ‘Annales des Sciences Naturelles,” ser. 3, vol. i., 
but the figure is not so good as those of Pringsheim, loc. cit. t. 4, fig. 3, 
and it certainly is not the same as the dry specimens so named in the 
collection of Algæ of Germany, above quoted, which is in the botanical 
collection in the British Museum. In the plants figured by Ralfs, 
Pringsheim and Suringar, and in mine, the upper surface of the fruit 
is flat, the frond is nearly of the same thickness from the centre to the 
circumference, being, if anything, rather thinner in the centre, —and 
this is the case in the youngest and oldest specimens. In the speci- 
mens of Bulbochate scutata of the German collection, the upper surface 
of the frond is convex, being more convex in the centre, and the upper 
surface is covered with swollen prominences. They can scarcely belong 
to the same genus, and I am inclined to regard the Bulbochate of the 
German collection as the type of that genus, and the genus Bulbochete 
of Brebisson, Ralfs, and Pringsheim to be the same as the genus Phyl- 
lactidium of Kuetzing. 
