ser. gongylosperme.^. { 5 ) fam. ehodymexiace.t:. 



Plate LXVIII. 

 PLOCAMIUM COCCmUJJM.—Li/ngb. 



Gen. Char. — Frond linear, solid, cellular, compressed or flat, much and distichously 

 branched ; ultimate ramuli pectinato-secuud in series on the upper edge of the 

 branches. Fructification of two kinds, on distinct plants : 1. Spherical tubercles 

 or coccidia, containing a mass of minute angular spores ; 2. Pods or stichidia, 

 frequently much branched, containing imbedded, roundish oblong, transversely 

 parted tetraspores. Name from TrX6Kanos, ' ' plaited hair. " 



Plocamium coccineum. — Frond cartilagiaous, linear, much branched 

 distichously ; branches irregularly alternate or secund, ultimate ramuli 

 in fours, pectinato-secund on the upper edges of the branches. Tubercles 

 lateral, sessile, spherical ; stichidia marginal, often two to three times 

 dichotomous. 



Plocamium coccineum. — Lyngh. Hyd. Dan. p. 39, t. 9; Grev. Alg. Brit. p. 98, t. 12; 



Hooh. Br. Fl. vol. ii. p. 293 ; Wyatt, Alg. Damn. No. 20 ; Ag. Alg. 



Medit. p. 155 ; Endl. 3rd Suppl. p. 52 ; Kiitz. Phjc. Gen. p. 449, t. 64 ; 



Mont. PI. Cel. Canar. p. 152 ; Hook. fil. Fl. Antarct. vol. i. p. 186 ; 



Harv. in Mach. Fl. Hib. part 3, p. 195 ; Harv. Phyc. Brit, plate 44 ; 



Harv. Man. p. 119 ; Harv. Syn. p. 102 ; Atlas, plate 39, fig. 178 ; Harv. 



N. B. A. part 2, p. 153 ; /. G. Agardh, Sp. Gen. Alg. vol. ii. p. 395. 

 Plocamium vidgare. — Lamour. Ess. p. 50; Gail. Diet. Sc. Nat. vol. liii. p. 368. 

 Plocamium Lynghyanum. — Kiitz. 1. c. p. 450. 

 Plocamium Binderianum. — Kiitz. 1. c. p. 450. 

 Delesseria coccinea. — Ag. Syn. p. 14 ; Hook. Fl. Scot, part 2, p. 101 ; Grev. Fl. 



Edin. p. 294. 

 Delesseria Plocamium. — Ag. Sp. Alg. vol. i. p. 180 ; Syst. p. 250 ; Mart. Fl. 



Brazil, p. 42. 

 Ceramium Plocamium. — Roth, Fl. Germ. vol. iii. p. 458 ; Cat. Bot. vol. ii. p. 161, 



and vol. iii. p. 107. 

 Fucus coccineus. — Huds. Fl. Angl. p. 586; Linn. Trans, vol. iii. p. 187 ; 



Stach. Ner. Brit. p. 106 ; Turn. Syn. vol. ii. p. 291 ; Hist. t. 59 ; 



E. Bot. t. 1242. 

 Fucus Plocamium. — Gm. Hist. p. 153, t. 16, fig. 1 ; Light f. Fl. Scot. vol. ii. 



p. 957 ; Esper, Ic. vol. i. p. 18, t. 2. 



Var. j8. uncinata. — Very small ; branches somewhat flexuous, more irregu- 

 lar and entangled ; ultimate ramuli patent or even recm-ved. 



Plocamium coccineum, j8 uncinata. — Harv. Phyc. Brit, plate 44, fig. 9. 



Plocamium coccineum, 5 U7icinatum. — /. G. Agardh, Sp>. Gen. Alg. vol. ii. p. 396. 



Hab. — On rocks and Algae. Everywhere common. Perennial. Summer and autumn. 



Geogr. Disr. — Plentiful in the temperate zones. Brazil {Martins) ; Cape Horn {Dr. 



Hooker) ; Auckland Island ; New Zealand ; Tasmania ; Cape of Good Hope {Dr. Harvey) . 



