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Ser. RHODOSPERMEZ. Fam. Gloiocladee. 
Puate CVI. 
CROUANIA ATTENUATA, J. 4. 
Gen. Cuan. Frond gelatinous, filiform, consisting of a jointed, single-tubed 
filament, whose joints are clothed with dense whorls of mimute, mul- 
tifid ramelli. Fructification, of two kinds on distinct individuals ; 
1. “ Favellidia subsolitary near the apex of the ramuli, affixed to the 
base of the whorled ramelli and covered by them, containing, within a 
hyaline membranaceous perispore a subglobose mass of minute spores”. 
2. Obovate fetraspores of large size, affixed to the bases of the ramelli.— 
Crovanta, (J. 4g.), i honour of the Brothers Crouan, of Brest, 
celebrated among French Algologists. 
Crovanta attenuata. 
Crovanta attenuata, J. 4g. Aly. Medit. p. 83. Endl. 3d. Suppl. p. 36. 
Mesoetora attenuata, 47. Syst. p. 51. 
Mesoetora moniliformis, Grif. in Wyatt, Alg. Danm. No. 197. Harv. Man 
p. 49. 
GRIFFITHSIA nodulosa, 4g. Sp. Alg. vol. ii. p. 136. 
CALLITHAMNION nodulosum, Kiitz. Phyc. Gen. p. 373. 
BATRACHOSPERMUM attenuatum, Bonnem. 
Has. Parasitical on the smaller A/yz. Annual. Summer. Very rare. 
On Cladostephus spongiosus at Salcombe Bay, Mrs. Wyatt. Mouse- 
hole near Penzance, Mr. Ra/fs. 
Gzoer. Distr. Mediterranean and Adriatic Seas. Atlantic Coast of France, 
very rare. South Coast of England. 
Descr. Fronds densely tufted, one to two inches high, very tender and gela- 
tinous, capillary, excessively branched, and bushy; the divisions alternate, 
many times divided, patent, moniliform, attenuated at the extremity. The 
branches consist of a jointed filament, with a very narrow endochrome, and 
wide limbus, from the nodes of which issue very dense, globular whorls of 
dichotomous, multifid ramelli. The lowermost joints of the main filament 
or axis are several times longer than broad; the upper ones becoming 
gradually shorter, and the ultimate are scarcely longer than their diameter. 
As each dissepiment produces its whorls, it thus happens that the lowest 
whorls are far asunder, the upper gradually closer together, and the ultimate 
ones imbricating each other. The ramelli of which the whorls consist are 
regularly dichotomous and fastigiate. Tetraspores of very large size, 
obovate, tripartite, borne on one of the basal joints of the ramelli, sessile. 
Favellg I have not seen. Colour a brownish or purplish red. 
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This beautiful little plant was first noticed by Bonnemaison, on. 
the northern shores of France, where it appears to be of as rare 
