Dr. Greville on some new species of Sargassum. 503 
There is also a section of Jungermannia, consisting entirely of 
exotic species, which approaches Southbya, though more remotely. 
The type of this section is Jg. turgescens, Tayl. et Hook. fil. in Crypt. 
Antarctica, p. 38, t. 64, which has the perianth slightly compressed 
laterally and truncate, but quite discrete from the involucre. ‘The habit 
too is widely different, the stems being much divided, scarcely radicu- 
lose, the leaves very concave, with a minute guttulate areolation (the 
cellules round, separated by wide interstices), and there are bifid 
stipules present. Alicularia strongylophylla, Eorund. J. c. p. 34, t. 62, 
has the perianth exactly as in Jg. turgescens, quite free and sometimes 
twice as long as the involucre; the chief differences being the /ess ~ 
cave leaves and the wider areolation (yet still equally guttulate) : 
is therefore not an Alicularia, and with Jg. turgescens might well 
constitute a new genus, of which other species are probably Jg. equata 
and humilis of the same authors. Possibly their Alicularia occlusa 
and the Jungermannia Liebmanniana of Lindenberg and Gottsche may 
go into the same genus, but of these I have not seen specimens. 
These species seem all intermediate between Southbya and the true 
on? which they approach through Jg. Taylori and its 
lies. 
On another side, Southdya has some affinity with a small group, 
of which Jungermannia hyalina is the European representative ; but 
‘these differ from it in the red radicles, and in the perianth being con- 
tracted and numerously plicate towards the mouth. 
[To be continued. ] 
XLIX. Alge Orientales :—Descriptions of new Species belonging 
to the genus Sargassum. By R. K. Grevitiz, LL.D. &c.* 
[Continued from p. 257. ] 
[ With a Plate. ] 
Art the moment when I have brought these descriptions of Sar- 
gassa to a close, I have learned that the first volume of the ‘ Ge- 
nera et Species Algarum’ by the younger Agardh, has appeared. 
This I was, of course, unprepared for, having never, in fact, even 
seen the work advertised. I would eladly have deferred bring- 
ing forward my present series of papers until I could have had the 
benefit of consulting that work, but it is now too late, and some 
confusion in nomenclature will be the probable result. It will be 
remembered that in commencing these descriptions I stated, that 
with few exceptions the subjects had been transmitted to me by 
my friend Dr. Wight for publication in the second volume of 
the ‘ Prod. Fl. Ind. Orientalis,’ and that the imterruption which 
had occurred in the continuation of that undertaking had in- 
duced me, after retaining my notes and drawings for many years, 
* Read before the Botanical Society of Edinburgh, April 12, 1849. 
