Johnson . — Observations on Phaeozoosporeae. 139 
receptacles were themselves branched (Fig. 5). This branch- 
ing was more frequently seen in plants in which the main stem 
was unbranched, and bore the stalked receptacles directly. 
This lends support to the view that the receptacles are modi- 
fied branches, and shows that the paraphyses themselves are 
apparently capable of trichothallic growth— one of many in- 
stances of a want of fixity of function in the various parts of 
a brown sea-weed. 
3. ASPEROCOCCUS Lamour. 
I have recently shown 1 that in the genus Punctaria Grev. 
plantlets arise on the old thallus by trichothallic gemmation , 
from the hairs with basal growth, to be found scattered, in 
tufts, over the surface of the thallus. I find a very similar 
gemmation in Asperococcus Lamour. Here and there, on the 
surface of Asperococcus , solitary hairs with basal growth may 
be seen 2 . In an old plant a hair may be seen developing 
into an Asperococcus plantlet. Quite recently Buff ham has 
discovered projecting plurilocular sporangia 3 in Asperococcus . 
There is much evidence that Asperococcus and Punctaria are, 
through A. compressus , much more closely related to one 
another than is at present admitted, Asperococcus being placed 
in the somewhat distant family Sporochnaceae 4 . 
4. Arthrocladia VILLOSA (Huds.) Duby. 
A. villosa can be dredged in abundance in Plymouth waters. 
The mode of growth of the thallus has been described and 
figured by Falkenberg 5 . The thallus is filiform, pinnately 
branched. The joints of the branches are beset with closely 
crowded whorls of pinnately branched septate filaments. It 
is on these filaments, towards their base, that the sporangia 
are formed. Each sporangium is described as stalked, chain- 
1 T. Johnson, Linnean Soc., Nov. 1890. 
2 J. Reinke, Atlas d. Meeresalgen, Taf. 4. 
3 Buffham’s discovery has not yet been announced in print, 
4 F. Hauck, Meeresalgen, xi. 
5 Falkenberg, Schenk’s Handb. ii. p. 221. 
