162 algjE. 



44. Chylocladia. Frond filiform, cylindrical, (often con- 

 stricted as if jointed,) gelatinoso-cartilaginous, pinky-red. — 

 Fructification double: 1. capsules, with angular seeds; 2. im- 

 bedded ternate granules. 



45. Gigartina. Frond cartilaginous, filiform, of a dull 

 red colour. Fructification double: 1. capsules, with minute 

 roundish seeds; 2. simple granules imbedded in the ramuli. 



46. Chondrus. Frond cartilaginous, dilating upwards into 

 flat, dichotomously-divided segments of a purplish or reddish 

 colour. Fructification : roundish capsules. 



47. Phyllophora. Frond proliferous from the disk, fur- 

 nished with an obscure midrib. 



48. Sph/erococcus. Frond cartilaginous, two-edged, linear, 

 distichously branched. Fructification ; mucronate, pedicellate 

 capsules, produced along the margin ; seeds ovate. 



49. Gelidium. Frond horny or cartilaginous, linear, more 

 or less regularly pinnated. Fructification double : 1. capsules, 

 imbedded in the ramuli ; 2. ternate granules. 



50. Ptilota. Frond compressed, filiform, pectinato-pin- 

 nate. Fructification : minute aggregated capsules, surrounded 

 by an involucre. 



Tribe XIII. Ceramie/E. Plants filamentous, articulated. — 

 Fructification double : 1. Capsules: 2. granules contained in 

 receptacles, or in distorted ramidi. 



51. Polysiphonia. Filaments longitudinally striated with 

 internal parallel tubes. Fructification: 1. ovate capsules; 

 2. granules in swollen ramuli. 



52. Dasya. Stems inarticulate, cellulose, the ramuli articu- 

 lated. Fructification: 1. ovate capsules: 2. lanceolate recep- 

 tacles, including granules in transverse fasciae. 



53. Ceramium. Filaments reticulated, dissepiments opaque. 

 Fructification: 1. roundish capsules, with membranous peri- 

 carps ; 2. oblong granules imbedded in the ramuli. 



54. Griffithsia. Filaments mostly dichotomous, dissepi- 

 ments hyaline. Fructification : 1. clustered capsules with hya- 

 line pericarps; 2. roundish, gelatinous, involucrated receptacles, 

 including minute granules. 



55. Calithamnion. Filaments mostly pinnated, dissepi- 

 ments hyaline. Fructification: 1. scattered capsules with hya- 

 line pericarps; 2. polymorphous receptacles, containing large 

 granules. 



56. Trentipohlia. Filaments minute, (mostly parasitical). 



