46 ON THE GENERA ANADYOMENE AND MICRODICTYON. 
beautiful regularly-placed cells that are to be seen in Anadyomene. 
This genus resembles Udotea in the form of its filaments, but differs 
in the branches being separated by a cellular expansion of the frond, 
instead of being close side by side. In this respect it is intermediate 
between Udotea and Anadyomene. 
l. C. Brownii, n. s. 
Has. Australia, R. Brown in Brit. Mus. A small fragment in my 
own collection from among Australian weeds. I have sent a portion 
of the latter to Dr. Harvey for his herbarium at Trinity College, Dublin. 
This is not the A. plicata of Agardh, described as having only a few | 
cells of large size. 
Professor Agardh describes another species, with doubt, under the 
name of 4. obscura, thus :—* fronde cuneata, venis obsoletis, in mari 
australi ad insulam Graham ; specimen dedit Gaudichaud. Radix sub- 
globosa. Frons ex angustiori basi (quasi stipula) dilatata, cuneata, 
longitudine digitalis, unciam lata, sublobata; venze uniplicatee, sparse, 
obsolete rubre. Color viridescens, luridus; substantia stipitis firmior, 
crassior, partis superioris membranacea." — (C. A. Agardh, Species Alga- 
rum, i. 400 (1823) ; Kütz. Spec. Algarum, p. 511 : 
This may be allied to Calomena. 
Genus 2. ANADYOMENE. 
The frond flabellate, stipitate, often imbricate at the base, formed of a 
succession of single ovate cells with minute cells in the interspaces ; 
midrib trifid or radiately branched; the primary cell with a series of 
diverging cells at the tip like a fan, all or three or five of the largest 
of which bear at their tip a similar series of diverging cells and 
branches. The upper part of the side of the main cells with a series 
of small cells on each side placed at right angles with the main 
cell; the disk of the frond formed of numerous small cells ; the 
Anadyomene, Lamouroux, Pol. Flex. 365; Agardh, Spec. Algarum, 
401; Kiitzing, Phyt. Gener, 254; Species Algarum, 511; Harvey, 
Nereis Bor. Am. iii, 49, 
‘This genus appears to have æ very extensive distribution; Wulfen 
and Lamouroux found it on the coasts of Europe, Webb and Berthelot 
at the Canaries, Professor Harwey in Australia, Gaudichaud in Rawak 
and the Sandwich Islands, La Sagra in Cuba, and Martius in the 
