OBDBBfl an i- (,i.\ BRA. 



XLV. Chylocladia. Frond (at lead the branches) con- 

 stricted at intervals and chambered. 



Order 9. Coralunai d, articulated, or crustaceous, 



mostly calcareous seaweeds, jnvrple when recent, fading on 

 exposun to milk-white, composed of cells in which carbonaU 

 of linn is deposited in an organized form. Tetraspores 

 tufted, contained in ovaU or spherical conceptacles 

 midia) furnished with a terminal pore. 



* Frond filiform, articulated. 

 XLYI . Coeallina. Frond pinnated. Ceramidia termi- 

 nal, simple. 

 XLVH. Jama. Frond (in the Brit, species) dichotomous. 

 imidia tipped with two born-like ramuli. 

 ** Frond crustaceous or foliaceous, not articulated. 

 XLVIIL Mklobesia. Opaque, stony; crustaceous, folia- 



ls, or Bhrubby. 

 XLIX.P ElLDENBBANDTIA. Cartilaginous (not stony), in- 



crusting rocks. 

 L.r Hapalidium (Kutz.). Minute, crustaceo-membrana- 

 ceous, hyaline, composed of a single stratum of cells 

 radiating from a centre. 



Order 10. Delesseriacejs. Rosy or purple-red or blood-i 



weeds, with a leafy, rarely filiform, areolated, inarticulate 

 frond, composed of polygonal cells. Leaves delicately mem' 

 branaceous. Fructification double : 1. Conceptacles 

 dia) external or half-immersed, hemispherical, usually im- 

 perforate, containing, beneath </ membranous pericarp, ". tuft. 

 of filaments, whost cells are finally changed into spoi 



-pores /// distinctly defined Bori, eitlu ■' or con- 



ed to proper leaflets (sporophylla). 

 LI. Dblessebia. Frond leafy, of definite form, with a per* 



current midrib. 

 LII. NlTOPHYLLUM. Frond leafy, irregularly lobed, with- 

 out midrib. 

 LIII. PloCAMIUM. Frond linear, compressed, distichously 

 much branched ; ramuli pectinate, acute. 



.11. Rhodymeniaobje. Purplish or blood-n 

 trith on expanded or filiform, inarticulate frond, composed 

 of polygonal cells ; occasionally train r* d by a fibroso-cellular 

 axis. Superficial ce\\B minute, irregularly packed, or (rarely) 

 disposed in excentric filaments. Fructification double : 1. 

 Oonceptacl - coccidia ■ lernoU or half -immersed, globost or 

 hemispherical, imperforate, containing, Lnoaih a thick peri' 



