Ser. RHODOSPERME®. Fam. Ceramiee. 
Puate XVI. 
GRIFFITHSIA DEVONIENSIS, Harv. (sp, 
Gen. Cuar. Frond rose-red, filamentous ; fi/aments jointed throughout, 
mostly dichotomous ; ramuli single-tubed ; dissepiments hyaline. /rue- 
tification of two kinds, on distinct individuals: 1, ¢etraspores affixed 
to whorled involucral ramuli; 2, gelatinous receptacles (favella), 
surrounded by an involucre, and containing a mass of minute angular 
spores. GRIFFITHSIA—so named by Agardh, in honour of Mrs. Griffiths 
of Torquay, the most distinguished of British Algologists. 
Grirritusta Devoniensis; filaments very slender, gelatinous, flaccid, dicho- 
tomous, the lower axils patent, the upper acute; articulations cylin- 
drical, 7-8 times as long as broad; jomts constricted; mvolucres 
whorled round the joits of the branches. 
Has. Muddy sea-shores, in deep water: rare. Plymouth, Rev. W. 8. Hore 
(July 1840). At Salcombe, Mrs. Wyatt (Sep. 1840). 
Groer. Distr. South of England. 
Descr. Filaments 2-3 inches high, tufted, very slender, dichotomously divided, 
fastigiate, the lower axils very patent, the upper acute; branches mostly 
naked, but sometimes throwing out short, root-like, lateral branchlets. 
Substance soft and gelatinous, closely adhering to paper, and having a gloss 
when dry. 4rticulations many times longer than broad, cylindrical, slightly 
incrassated at each end; the joints constricted. Tetraspores affixed to the 
inner face of short involucral ramuli which are densely whorled round the 
main filaments, at the apex of an articulation, where they form roundish 
masses. Favelle unknown. Colour rose-red, soon discharged in fresh-water. 
This graceful little plant, which appears different from all the 
species of G'rifithsia yet described, was discovered in the summer 
of 1840, by the Rev. Mr. Hore, at Plymouth ; and, in the autumn 
of the same year, added to the flora of Devonshire by Mrs. Wyatt. 
I record this latter habitat in the specific name because it affords 
me an opportunity, of which I gladly avail myself, to connect 
the name of Mrs. Griffiths with that of the county whose shores 
she has so long and so successfully explored, where the best part 
of her life has been spent, and the natural history of which, in 
all its varied branches, her researches have so greatly advanced. 
G. Devoniensis obviously belongs to the section of the genus 
typified by @. corallina, from which species the smaller size, more 
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