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 (/ULOVOS, single ; apflpoe, a joint ; SaKTuAoe, 

 a finger), having the ultimate rays or dactyls each 

 composed of a single cell. Monarthrodactylae, 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 (MOV, an egg; KO^TTOQ, a fruit), a term applied to the 

 oospore. 



oogonium (MOV, an egg ; yov>), seed), the female sexual organ 

 consisting, in the Charophytes, of the sac composed of 

 five spiral-cells which enclose the egg-cell. 



oosphere (yov, an egg; crfyatpa, a globe), the egg-cell before 

 fertilization. 



oospore (oi>, an egg; cnrooa, a seed), the fertilised egg-cell. 



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



tphysema ((pvfr^/na, an inflation), a term formerly applied to 

 the stem or branchlet. 



polyarthrodactylous (TTO\V^, many ; apOpov, a joint ; SokTuAoc, 

 a finger), having the ultimate rays or dactyls each 

 composed of more than two cells. Polyarthrodactyl&j a 

 section of Nitella [Braun]. 



proembryo (TT^O, for; ^Ppwov, 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; vf?//a, a thread), another term for 

 the proembryo. 



punctate (punctum, a small 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 Nitdlese ; 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 (reticidum, a little net), finely netted, applied to tht> 

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



