340 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
Marine Algae of Greenland.* * * § — In an exhaustive account of the sea- 
weeds of Greenland, M. L. Kolderup Eosenvinge describes the following 
four new genera, the first three belonging to the Phaeophyceae, the last 
to the Chlorophyceae. 
Coelocladia (Scytosiphonaceae). Frond cylindrical, hollow, branched, 
plurilocular sporanges shortly cylindrical, occupying the whole of the 
thallus, usually from two to four coalescing by their edges. 
Ompha lophyll u rn (Punctariaceas). Thallus probably at first saccate, 
soon bursting on one side and spreading out into a membranous lamina, 
composed of one or two layers of cells, destitute of hairs, fixed on a short 
umbilical stipe ; unilocular sporanges scattered, similar in form to the 
vegetative cells. 
Symphyocarpus (Ectocarpaceae). Thallus crustaceous, composed of 
a basal layer and erect filaments ; the former composed of a single layer 
of branched irregularly radiate filaments, at first free, afterwards 
coalescing ; erect filaments short, equal in length, simple or pseudo- 
dichotomous, free, but packed closely together ; each cell with a disk- 
shaped chromatophore on its upper wall : plurilocular sporanges oblong- 
obovoid, from two to four confluent at their edges, situated at the apex 
of erect filaments, opening at their apex. 
Chsetobolus (Mycoideaceas). Thallus epiphytic, hemispherical or 
nearly globular, the cells dividing in all directions ; superficial cells 
(except the marginal ones) ending in a long hair which is not septated 
nor separated by a septum ; propagation probably by zoospores formed 
in the superficial cells. 
Another new genus, Gayella , is formed from Schizogonium radicans 
and TJlothrix discifera. The following new species are described: — 
Lithothamnion flabellatum, L. tenue, Laminaria groenlandica. 
Fertilisation of Nemalion multifidum.f — By laying in a saturated 
solution of picric acid, washing, and staining with borax - carmine. 
Prof. N. Wille has been able to follow the passage of the pollinoid into 
the trichogyne in this sea-weed, and its coalescence with the female 
nucleus. 
Parasitic Sea-weeds.t — Herr F. Oltmanns describes the following 
new species of parasitic sea-weeds from the Baltic : — Acrochsete parasitica 
on Fucus vesiculosus , serratus, and inflatus, somewhat resembling Mycoidea 
parasitica ; Ectocarpus fungiformis on species of Fucus ; Streblonema 
sequale on Chorda filum. 
Algae of the Lake of Plon.§ — Dr. H. Klebahn and Herr E. 
Lemmermann enumerate the species comprising the algal vegetation 
('including Characeie) of the Lake of Pldn. Several new species are 
described, and the following new genera : — 
Klebahniella (Chastophoraceae). Thallus disciformis v. pulvinatus, 
laete viridis, modo epiphyticus modo endophyticus, e filamentis 
irregulariter ramosis ad septa ffagilibus compositus ; rami diversi, alii 
* Medd. om Gronland, iv. (1893) pp. 765-9S1 (2 pis. and 57 figs.) ; Ann. Sci. 
Xat. (Bot.), xix. (1894) pp. 53-164 (57 figs.). 
t Ber. Deutsch. Bot. GeselL, xii. (1894) Gen. -Yers. -Heft, pp. 57-60 (6 figs.). 
X Bot. Ztg., lii. (1895) l te Abtheil.. pp. 207-16 (1 pi.). 
§ Forscliungsber. Biol. Stat. zu Plon. 1895. 67 pp. and 15 figs. 
