GLOSSARY. 75 



manubrium {lat. a handle), an elongated cell proceeding from 

 the centre of the inner side of each of the eight plates 

 which form the outer wall of the antheridium, bearing, at 

 its distal end, head-cells to which the filaments containing 

 the antherozoids are attached. 



monarthrodactylous (ftovoe, single ; lipOpog, a joint ; SoktuXoc, 

 a finger), having the ultimate rays or dactyls each 

 composed of a single cell. Monarthrodactylx, a section 

 of Nitella [Braun] . 



mucus, mucilage, a gelatinous envelopment of the reproductive 

 organs of certain species of Nitella. 



nucleus {lat. kernel), a term applied to the oospore. 



nucule {nucula, a small nut), a term applied to the oogonium. 



oocarp {(^bv, an egg; Kapirog, a fruit), a term applied to the 

 oospore. 



oogonium (([lov, an egg ; yovri, seed), the female sexual organ 

 consisting, in the Chai-ophytes, of the sac composed of 

 five spiral-cells which enclose the egg-cell. 



oosphere (liJov, an egg; <T<paLpa, a globe), the egg-cell before 

 fertilization. 



oospore {(Jjiov, an egg ; cnropa, a seed), the fertilised egg-cell. 



papillae [papilla, a nipple), nipple-like protuberances. 



tphysema (^uo-ij/xa, an inflation), a term formerly applied to 

 the stern or branchlet. 



polyarthrodactylous [iroXvg, many; agOpov, a joint; daKTvXog, 

 a finger), having the ultimate rays or dactyls each 

 composed of more than two cells. Polyarthrodactylx, a 

 section of Nitella [Braun] . 



proembryo {vpo, for; i/xfipvov, a foetus), an asexual shoot 

 which proceeds from the nodal-cell of the oospore and 

 from which the sexual plant arises as a lateral shoot. 



protonema (Trporoc, first ; vijjua, a thread), another term for 

 the proembryo. 



punctate {punctum, a smuU hole, a puncture), marked with 

 minute depressions or holes, applied to the decoration of 

 the membrane of the oospore. 



ray, the limb of a branchlet in the Nitellese ; primary ray, the 

 basal portion or stalk of the branchlet ; secondary ray, a 

 limb arising at the first furcation ; tertiary, quaternary, 

 quinary rays, limbs arising respectively at the second, 

 third and fourth furcations ; ultimate ray, or dactyl, a limb 

 arising at the uppermost furcation. 



reticulate [reticulum, a little net), finely netted, applied to the 

 decoration of the membrane of the oospore when net-like. 



