— 256 — 



(Crouania)^ Grifpthsia^ Haliirus, Phlehothamnion, Hormoce- 

 ras (Gongro-Echino-AcanthocerasJ^ Ceramium (CentrocerasJ^ 

 Wrangelia, Spirydia (BinderaJ. 



h. PtilotecB noh. thallus compressus, gracilis, dichoto- 

 mus V. bipinnatifidus, poljsiphonius, epithallio perenchyma- 

 tico;Javellae involucratae; tetroidia i\i^\c?\\A:Ptilota^ Wlicrocladia. 



c. Heterocladiece: thallus ramosus, axi tubuloso 

 phragmifero, mesolhallio fibrilloso, cpithallio perenchymatico, 

 ramulis confervinis confertissimis, telroidia occultanlibus: He- 

 terocladia., Thamnocarpus Harvey. 



d. J\ho d oplc xie ce: thallus spongiosus, decbmposite 

 et subdichotomo lobatus, totus e catenulis reticulatis, extror- 

 sum liberis et letroidia e;ereutibus, constans: Tihodoplexia, 

 Dictjurus ? 



FAM. 21. GIGARTININiE noh . 



(Periblastese Kzg. Cryptonemeae I. Ag. <). 



Algae marinae rubentes, siccalae fuscesc. v. expallentes, 



thallo filari v. laminari, integro, dichotomo v. decomposite 



pinnato, solido, laxo v. cavo, endothallio filari reticulato v. 



parenchymatico mono-dimorpho, rpilhallio percnchymatico, 



saepe catenulato. Cavernulae h immersue^ ovulis glomera- 



tis, V. cistulae placenliferae. Tetroidia varia, epithallio v. ne- 

 matheciis immersa: 



a. Haly m eni c ce: Thallus laminaris v. teres, lubricus, 

 solidus, laxus v. cavus, e catenulis internis loniiitudinalibus 

 et periphericis horizontalib. dichotomis conflatus, peridermi- 



de solida v. gelalinosa. Cavernnlae ovnligerae h profundae 



et quibusdam tetroidia giobosa v. discoschiza intra calenulas 

 thalli V. in oocloniis: -^ Nemalion., Dudresnaja, Gjmno- 



phloea, Ginannia, Haljmenia, Halarachnion^ Dumontia^ Ca- 

 tenella. 



b. Ca ul ac anth e ce: thallus filaris, ramosus, axifer, en- 

 donematicus; tetroidia globosa: — Caulacanthus^ Endocladia, 

 Glojopeltis.. 



