291 
ADDITIONAL NOTES ON ANADYOMENE AND MICRO- 
DICTYON, WITH INDICATIONS OF A NEW GENUS 
MACRODICTYON (Conf. Journ. of Bot. 1866, pp. 41, 65.) 
By Dr. J. E. Gray, F.R.S,, ETC: 
My excellent friend, the veteran botanist, M. Lenormand, of Vire, 
in Normandy, has with his usual kindness sent me all his collection of 
specimens of Anadyomene and Microdictyon for examination. They 
are interesting as showing the geographical distribution of the species, 
and as containing a new form of Netted Confervacez, which I propose 
to call Macrodictyon. 
Anadyomene stellata. HAB. Coast of France, Fréjus, M. Gérandy, 
1861; Cannes, M. Chauvin, 1839. Shores of the Adriatic (determined 
by M. Kiitzing, 1849). Nizza. Spalato. 
Var. Floridana ? Key West, M. Bailey, 1849; Baia de Bahama, 
M. Chauvin, 1825; Bahia, M. Moricand, 1848, examined by M. 
Agardh 1845 (“ Anad. plicata ?") ; Island of Guadaloupe, M. Du- 
chassaing, 1853. 
Var. or allied species with the main branches elongated, forked and 
trifid. Has. Canaries, M. J. M. Despréauz, 1840. 
Anadyomene (Stenocistus) Lenormandii; frond coriaceous, wedge- 
shaped, imbricate, radiating from a common base, the midrib promi- 
nent on the underside near the base; the lower joint linear, several 
times longer than broad, with radiating group of 2-3 or rarely 4 
cylindrical branches at the tip; the apical cells shorter; interspaces 
between the main cell wide, filled with minute cells. AB. Isle of 
Celebes, Cab. M. Lenormand, Vire. A larger, coarser plant than A4. 
Wright. 
Microdictyon Velleyanum. Has. New Caledonia; Port Jackson, 
Harvey. The plant increases in size by the extension of the main fila- 
ment, which gives out an oblong cell on each side of each articula- 
tion; these cells elongate, and at length coalesce with cells from other 
branches and form a network; the development is somewhat like that 
shown in Dr. Harvey's plate of Struvea plumosa, Phyc. Austral. t. 32, 
but the genus differs entirely from Séruvea, and having no one-celled 
central midrib, which is the original of all the frond. 
Microdictyon tenue, Gray. “Has. Red Sea. There is a specim 
of this species from the Red Sea in M. Lenormand’s herbarium, Vii 
v 2 
