ADDITIONS TO MARINE FLORA OF CHANNEL ISLANDS 199 
Mesogloia lanosa Crn. 
Carpomitra costata Batt. 
.Laminaria Cloustoni Edmondst. 
Ghantransia coespitosa L. 
Gelidium crinale J. Ag. 
Gailymenia reniformis J. Ag. var. undulata J. Ag.; var. cuneata, 
J. Ag.; var. Ferrari J. Ag. 
Galliblepharis lanceolata Batt. var. divaricata Holm. & Batt. 
Chylocladia kali for mis Hook. var. squarrosa Harv. 
Nitophgllum litteratum J. Ag. 
Fhodomela subfusca Ag. 
Spermothamnion Turneri Aresch. var. monoica Selim. 
Antithamnion crispym Thur. 
Platoma marginifera J. Ag. This plant is very rare. Whitsand 
Bay and Padstovvare the only other British localities. The following 
description is translated from Bornet et Thuret’s Notes Algologiques, 
i. p. 49, pi. xvi. :— 
“A large and beautiful species gathered at Biarritz-Guethary, 
June—July, a deep-water plant found also in crevices of rocks and on 
stones, it ascends even to | tide level if there is no complete desic¬ 
cation. Tufts of 10-12 plants resembling in form, size and division 
deep water specimens of j Rliody menia palmata, colour a soft wine-red, 
gelatinous to the touch like llalgmenia. The base of the plant has 
a short round stalk attached to the rock by an orbicular disc (epate- 
ment) regularly and dichotomously divided, typically palmatilid. 
Tetraspores are unknown. Antheridia consist of whitish cells situated 
on the extremities of the cortical filaments. Cystocarps are very 
small and hardly visible to the naked eye, immersed in the cortical 
tissue, the spores escaping by a narrow canal between the peripheral 
filaments.” 
Schmitziella endophloea Born. & Batt. 
Lithopliyllum pustulatum Fosl. 
Guernsey. 
Lady (Catherine Babey) Mansell (1781-1841), wife of Bear- 
Admiral Sir Thomas Mansell, B.N., K.C.B., was the sister of Mr. P. 
C. Lukis, the Guernsey archaeologist, whese house at St. Peter Port 
with its large and interesting collection has been converted into a 
museum. She also studied concliology, and collected for the most 
part at Le Crocq and also along Perelle and Yazon Baj's. Her 
collection, already mentioned, is in beautiful preservation and contains 
107 species and varieties, one of which, Ceramium pennatum , has not 
been previously recorded for Guernsey. There is also a specimen of 
Cliondria ccerulescens —a plant which I had collected in 1914 and 
listed in 1920 as new to the island. 
A list of the known Marine Algae of Guernsey was published bv 
me in 1920 as a Supplement to this Journal; on a visit in Oct.-Dec. 
1921, I again did some collecting. I was disappointed in not finding 
Nemastoma dichotoma , one of the plants recorded as new to Britain, 
Cliondria ccerulescens , or Ghantransia Lorrain-Smithies ; possibly 
