HOW TO KNOW THE SEAWEEDS 



COMPRESSED: somewhat 

 flattened. 



CONCEPTACLE: a cavity 

 (either sunken or within 

 a raised dome) with one 

 or more openings to the 

 thallus surface and bear- 

 ing reproductive organs. 

 Usage in the Red Algae 

 is largely restricted to the 

 family Corallinaceae. 



Constantinea (No. 93) 141 

 simplex 1 4 1 



Corallina (No. 104) 117 

 officinalis 1 1 7 

 vancouveriensis 1 1 7 



CORONATE: in the form of 

 a crown; provided with 

 a crown. 



CORTEX: the outer tissue 

 of a thallus external to 

 the medulla and (or) the 

 central axial filament and 

 usually of smaller or 

 shorter cells, some of 

 which are pigmented. In 

 Fig. 247 a cross section 

 of a cylindrical red alga 

 is shown in which a cen- 

 tral axial filament is 

 present within a large- 

 celled medulla which in 

 turn is surrounded by a 

 small-celled cortex. 



Figure 247 



CORTICAL: pertaining to the 

 cortex. 



CORTICATED: provided with 

 a cortex, often by second- 

 ary growth from the axis. 



Costaria (No. 57) 129 

 costata 1 29 



Cryptonemia (No. 110) 1 52, 

 153 

 obovata 1 52, 1 53 



Cryptopleura (No. 154) 136 

 violacea 1 36 



CRYPTOSTOMATA: sunken 

 cavities in a thallus (ap- 

 plied to certain Brown 

 Algae) containing only 

 hairs. 



Cumagloia (No. 83)' 36 

 andersonii 36 



Cymodocea 1 84 

 manatorum 1 84 



Cymopolia (No. 27) 113 

 barbata 1 1 3 



CYSTOCARP: the "female" 

 reproductive structure in 

 most Red Algae. It con- 



sists in the Florideae of 

 carpospores and gonimo- 

 blast filaments, and, when 

 the cystocarp protrudes 

 from the surface of the 

 thallus, of a special peri- 

 carp. The cystocarp may 

 be deeply embedded in 

 the thallus (as in Fig. 248) 

 or emergent and protrud- 

 ing. One or more osti- 

 oles may be present. 



Figure 248 



Cystoclonium (No. 117) 



purpureum 65 

 Cystoseira (No. 77) 106 



osmundacea 1 06 



65 



Dasya (No. 157) 49, 50 

 pacifica 50 

 pedicellata 50 



Dasycladus (No. 23) 74 

 vermicularis 74 



DECIDUOUS: falling off af- 

 ter a time. 



Desmarestia (No. 45) 44, 

 139 



aculeata 139 

 farcta 44 

 media 44 

 munda 1 39 

 viridis 44 



DETERMINATE BRANCHES: 

 branches having a more 

 or less definite limit to 

 their length of growth. 



DIAPHRAGM: a cellular par- 

 tition across a hollow por- 

 tion of a thallus. 



DICHOTOMOUS: forked (us- 

 ually repeatedly). 



Dictyoneurum (No. 62) 128 

 californicum 1 28 



Dictyopteris (No. 32) 132 

 delicatuia 132 

 justii 1 32 

 plagiogramma 1 32 

 polypodioides 1 32 

 zonarioides 1 32 



Dictyosiphon (No. 53) 65 

 foeniculaceus 65 



Dictyosphaeria (No. 12) 90 

 cavernosa 90 



Dictyota (No. 31) 162 

 dichotoma 162 

 flabellata 162 



Digenia (No. 169) 54 

 simplex 54 



Diplanthera 185 

 wrightii 185 



DIPLOID: the condition in 

 the life history of an alga 

 in which each cell has 



double the haploid num- 

 ber of chromosomes 



DISCOID: in the form of a 

 disc. 



DISTICHOUS: in two ranks 



DISTROMATIC: consisting of 

 two layers of cells. 



Dumontia (No. 90) 98 

 incrasiata 98 



Ectocarpus (No. 28) 82 

 Egregia (No. 69) 104 



laevigata 1 04 



menziesii 1 04 

 Eisenia (No. 70) 1 55 



arborea 1 55 

 Elachista (No. 36) 81 



fucicola 8 1 

 Endarachne (No. 52) 148 



binghamiae 1 48 

 Endocladia (No. 95) 56, 60 



muricata 56, 60 

 Enteromorpha (No. 4) 95 



clathrata 95 



linza 95 



tubulosa 95 

 EPIPHYTIC: growing at- 

 tached to another plant. 

 ESTIPITATE: without a stipe. 

 Eucheuma (No. 114) 40. 



isiforme 40 

 Eudesme (No. 43) 34 



virescens 34 



Farlowia (No. 91) 174 

 Fauchea (No. 131) 166 

 fryeana 1 66 

 laciniata 1 66 

 FILAMENTS (cell form): the 

 slender, elongated form 

 assumed by certain cells, 

 especially in the medulla 

 of many Red Algae, Fiq. 

 249. 





Figure 249 



FLABELLATE: shaped more 

 or less like a fan. 



FLABELLUM: the fan-like 

 portion of a thallus. 



FLAGELLATED: provided with 

 a flagellum. 



FLAGELLUM: a whip - like 

 process of protoplasm 

 which provides locomo- 

 tion for a motile cell. 



193 



