Phylum Rho do phyta [51 



Order 5. Coeloblastea [Coeloblasteae] Kutzing Phyc. Gen. 438 (1843). 

 Order Rhodymenieae J. Agardh Sp. Alg. 2: 337 (1851). 

 Rhodymeninae Schmitz in Flora 72: 442 (1889). 



Order Rhodymeniales Engler in Engler and Prantl. Nat. Pfllanzenfam. I Teil, 



Abt. 2: X (1897). 



Heterocarpea producing auxiliary cells terminally on brief filaments which grow 



from the supporting cells of the carpogonial filaments before fertilization; cystocarps 



enclosed in cup- or vase-like pericarps; the thalli (cylindrical or flattened, branched 



or unbranched) usually hollow. Champia may be regarded as the standard genus. 



In various red algae, the germinating carpospore or tetraspore gives rise to a globe 

 of cells which grows to produce the thallus (Kylin, 1917). In the present group the 

 sporeling is particularly blastula-like. Its upper layer of cells becomes a ring of apical 

 cells, of definite number, distinguishing the group from others which grow by apical 

 cells either of a single filament or of a fascicle of indefinite number. The apical cells 

 are indeed homologous with the apical cells of filaments, but the cells derived from 

 them are arranged in a three-dimensional pattern as in the tissues of higher organisms; 

 it is only in the reproductive structures that the filamentous structure remains evident. 

 The order thus limited by Kylin (1932) is a specialized group including only the 

 two families Rhodymeniacea [Rhodymeniaceae] Hauck and Champiea [Champieae] 

 Kiitzing. The latter family is the more specialized; the hollow thalli are partitioned 

 by transverse septa and the supporting cells produce usually just two auxiliary cells. 

 In many examples of this family, after fertilization and the fusion of the zygote with 

 the auxiliary cells, the latter proceed to unite with further neighboring cells to pro- 

 duce a massive coenocyte from which the brief carpospore-bearing filaments arise. 

 The resulting structure is deceptively similar to that which occurs in the Corallinea. 

 The parasite Faucheocolax and its host Fauchea belong to this order. 



Order 6. Floridea [Florideae] C. Agardh Syst. Alg. xxxiii (1824). 



Order Floridees Lamouroux in Ann. Mus. Hist. Nat. Paris 20: 115 (1813). 



Section Florideae C. Agardh Synops. Alg. Scand. xiii (1817). 



Orders Trichoblasteae, Axonoblasteae, and Platynoblasteae Kiitzing Phyc. Gen. 



370,413,442 (1843). 

 Orders Ceramieae, Spyridicae, Chondrieae, and Rhodomeleae J. Agardh Sp. 



Alg. vol. 2 (1851-1863). 

 Ceramiales Oltmanns Morph. u. Biol. Alg. 1: 683 (1904). 

 Order Ceramiales Kylin in Kgl. Svensk. Vetensk.-Akad. Handl. 63, no. 11 : 132 

 (1923). 

 The Floridees of Lamouroux included the whole group of red algae organized as 

 four genera, Chondriis Stackhouse and the new genera Claudea, Delesseria, and 

 Gelidium. Lamouroux listed first Claudea and Delesseria, belonging to the present 

 order, to which the name is accordingly applied. 



This order is characterized by specialized strict patterns in the development of the 

 feniale reproductive structures. The carpogonial filament is always of four cells. The 

 supporting cell initiates, in definite patterns, brief additional filaments. After fertili- 

 zation, the supporting cell cuts off one more cell adjacent to the zygote, and this be- 

 comes the auxiliary cell. The spore-bearing structures developed from it are naked 

 in the more primitive examples; in most, they are protected by pericarps, which, in 

 some examples, begin to develop before fertilization. 



There are four families, all numerous in species: Ceramiea (Harvey) Kutzing, 



