HOW TO KNOW THE SEAWEEDS 



SESSILE: borne without o 

 stipe or stalk. 



SIMPLE: unbranched. 



SOLITARY: consisting of only 

 one; each one separate 

 by itself. 



SORUS (pi. sori): an aggre- 

 gation of reproductive or- 

 gans in a particular re- 

 gion or associated with 

 some specilization of struc- 

 ture. 



SPADIX: a kind of inflores- 

 cence in certain marine 

 seed plants. 



SPATHE: a large bract en- 

 closing a spadix. 



SPERMATIA: the non-motile 

 male gametes of the Red 

 Algae. 



Spermothamnion (No. 145) 

 85, 87 

 snyderae 87 

 turneri 85, 87 



Sphaerotrichia (No. 42) 59 

 divaricata 59 



Spongomorpha (No. 8) 78 

 arcta 78 

 coalita 78 



SPOROPHYTE: in the life 

 history of an alga, the 

 asexual generation which 

 produces diploid spores. 



Spyridia (No. 136) 47 

 aculeata 47 

 filamentosa 47 



STELLATE: provided with 

 points like a star. 



Stenogramme (No. 122) 164 

 interrupta 1 64 



Stilophora (No. 44) 37 

 rhizoides 37 



STIPE: the basal, stem-like 

 part of a thallus beneath 

 an erect blade. 



STIPITATE: Borne on a 

 stripe 



STOLONIFEROUS: producing 

 stolons. 



STUPOSE: consisting of or 

 provided with an abund- 

 ance of rhizoids or hairs 

 which may form a spongy 

 mass. 



SUB-: a prefix denoting a 

 degree of, or an approach 

 to, some quality; some- 

 what. 



SYMPODIAL: a method of 

 branching in which the 

 leading apex is regularly 

 and successively replaced 

 by a branch from below 

 which then assumes the 

 terminal position for a 

 time until in turn re- 

 placed. 



Syringodium 1 84 

 filiforme 184 



TERETE: circular in trans- 

 verse section. 



TETRASPORANGIUM: an 

 asexual reproductive struc- 



ture in the Red Algae 

 (Florideae) in which the 

 divisions produce four 

 spores (tetraspores). Fig. 

 258. 



Figure 258 



Thalassia 183 

 testudinum 1 83 



THALLUS: the entire plant 

 body of an alga. 



TRABECULAE: protuberances 

 from the inside of the 

 cell wall of species of 

 Caulerpa. 



TRANSECTION: a section 

 cut crosswise. 



TRICHOBLAST: a simple or 

 branched, uniseriate, hair- 

 like filament extending 

 from the surface (usually 

 at the tips) of certain red 

 algae. 



TRICHOTHALLIC: a manner 

 of growth in which cell 

 division occurs at the base 

 of one or more apical 

 hairs. 



TRUNCATE: as though cut 

 off at the end. 



TUBERCULATE: warty. 



U 



Udotea (No. 20) 119 

 flabellum 1 1 9 



Ulothrix (No. 1) 75 

 implexa 75 



ULTIMATE: the last order. 



Ulva (No. 3) 20, 21, 71 



UNILATERAL: one-sided. 



UNISERIATE: consisting of a 

 single row of cells, either 

 branched (Fig. 259), or 

 unbranched. 



UNIZONAL: consisting of a 

 single zone or tier of 

 cells. 



Urospora (No. 6) 77 

 penicilliformis 77 



UTRICLE: a specialized, in- 

 flated, sac-like end of a 

 filament of Codium of 

 which the whole surface 



layer of the thallus is 

 composed. 



VACUOLATE: with scant 



contents within the cell 



cavity. 

 Valonia (No. 11) 28, 75, 



125 



aegagropila 75 



ventricosa 28, 125 

 VERTICILLATE: whorled. 

 VESICLE: an air bladder or 



float. 



W 



WHORLS: verticils or circles 

 of branches or organs 

 about an axis. 



Wrangelia (No. 137) 51 

 penicillata 51 



Zanardinula (No. 109) 160, 



179 



andersoniana 179 



corne.a 1 60 



lanceolata 1 79 



Ivallii 179 

 Zonaria (No. 35) 134 



far low a 1 34 

 Zostera 1 80 



marina 180 



marina var. latifolia 1 80 



V-. 



Figure 259 



197 



