878 THE JOURNAL OF BOTANY 
to the Zostera leaves, and in most cases accompanied by Punctaria 
fronds at 
e margin, or mo 
rarely on the surface, of the Zostera leaf; but they soon swell into 
globose or pear-shaped fronds, occasionally solitary, but much more 
_ along the edge of the upper portion of the leaf. The sori are borne 
on fronds of all ages, and greatly resemble those of Rhododermis. 
The a egenen — of the genus is doubtfu 
I have ted the species ~ my friend Mr. George, an inde- 
fatigable i peroie to whom, as this re ie IT am deeply 
indebted not oy, mS beautiful specimens of the present uate but 
for other rare eeds from the Scilly ards pe elsewhere. 
Mr. George’s — woliaclion os marine alge, with its sets of mag- 
nificent specimens, the reward of assiduous collecting continued ~ 
many successive years, is but little known to botanists ; but it 
in vain that I Beye pegs urged my friend to publish his fae 
Erythroderm membranaceous, horizon- 
tally expanded, cgay or indefinite in Palas adhering closely 
to the substratum, monostromatic or composed of very few lay ers of 
polygonal salle arranged in dichotomous rows, flabellately fiaiing 
from several points. Chromatophores small, disc-shaped, severa 
in each cell; tetraspores Siete arranged in moniliform, simple 
or forked filaments, which are packed together in external convex 
nemathecia. Antheridia and cystocarps unknow 
37. BE. Alleni, sp. unica. Characters those of ee genus. Fronds 
6-7. mm. in diaineter, and about 15 p» in thickness ; cells 6-12 p 
long, 6-9 » broad; nemathecia slightly elevated, about 1 mm. in 
diameter ; nema thecial pee simple or branched, each formed 
of 4-6 tetraspores, 9-12 » in diameter. Tab. nost. figs 
On pieces of broken gee dredged from 4-6 fathom water, 
Queen’s Ground, Plymouth, March, 1 
I found this interesting and manta little plant on some bits 
of broken earthenware sent to me, amongst some shells, stones, &c., 
t he 
structure, but the tetraspores are borne in true nemathecia, not 
unlike those of Phyllophora gigs tg lia. I do not know of an 
other. incrusting oon with similar nemathecia. Until the cysto- 
ee .. Mr. E. J. Allen, the ais Director of the Plymouth 
_ 
endear HAPALIDIOIDES Foslie = Mr opesta HAPALIDI- 
OIDES tet Fl. Finist. p. 150. Berwick-on-Tweed, Jan. 1887; 
EL. A West coast. of Ireland; Foslie. 
89. Mxeuopesta zonauis Foslie = Hapataprum zonate Orn. FI. 
Finist. p. 149. Plymouth, April, 1897; /&. 4. B. 
40. Laraopayiiuum Crovani Foslie, ‘‘ Some new or critical Litho- 
thamnia,” p. 17. Berwick, Fe. 1889; HE. A. B 
