178 NEMATOPHYCES. 
Famity VI. ULOTRICHEA. 
Algé growing either in fresh water (Ulothrix), or marine or 
sub-marine (Hormiscia), or terrestrial (Hormidium, Schizo- 
gonium), either of a bright green or yellowish green colour. 
Threads very shortly articulate, simple, very rarely dividing into 
single branches, free, now and then laterally connate in bands 
(Schizogonium). 
Primitive cells always many times longer than their diameter, 
after repeated division equal, or shorter (rarely a little longer), 
all fertile. Cell-membrane either thin (Ulothriz, Hormidium) 
or thick, sometimes very thick, and distinctly lamellose (Hor- 
miscia). Cell-contents at first effused, parietal, including a 
starch granule, after simple or repeated division transmuted 
into gonidia. 
Gonidia of two kinds, Macrogonidia spherical, ovoid, or 
ovate-oblong, rounded at one pole, and acute at the other, fur- 
nished with 2 or 4 vibratile cilia, often germinating in the 
mother-cell without sexual fertilization. Microgonidia much 
smaller, of similar form, furnished with two cilia at one ex- 
tremity. Both kinds of zoogonidia produced within the cells of 
the threads, emitted either by a poriform opening in the mother- 
cell, or by the splitting or breaking up of the mother-cell, 
For detailed information on this family consult Braun’s ‘“ Rejuvenes- 
cence” (Ray Society), pp. 148, 161, 184, 208, 223 ; Dr. A. Dodel, “ die 
Kraushaar-Alge,” Ulothria zonata, in Pringsheim’s “ Jahrbucher,” t. x. ; 
Cienkowsky ‘‘ Zur Morphologie der Ulotricheen” (1876); Thuret, in 
“© Ann. des Sciences Naturelles,” xiv. (1850), p. 222; and Dr. Braxton 
Hicks, in “ Quarterly Journal of Microscopical Science,” 1861, p. 157. 
Genus 66, HORMISCIA. Ares. (1866.) 
Articulate thread fixed by the basal cell, which is attenuated 
downwards; simple, or now and then emitting branchlets. 
Cells abbreviated, enclosed by a thick cell-membrane, which is 
often manifestly lamellose. ell-contents green, parietal, 
including an amylaceous granule. 
Propagation by macrogonidia and microgonidia.—Rabh. 
Alg. Eur, 11. 361. ‘ 
