Sek. GONGYLOSPERME.'E. ( 201 ) Fam. CERAMIACEiE. 



CALLITHAMNION J)A.\lESll.—L>/ngh. 



Gen. Char. — Fronds filiform and articiiLated, soraetimes at length in the older parts 

 cellular and partially opaque, single-tubed ; divisions mostly pinnate, dissepiments 

 hyaline. Fructification of two kinds, on distinct plants ; 1. Favellse, mostly 

 lateral on the branches, and filled with minute spores ; 2. Tctraspores, external, 

 tripartite or cmciate. Name from Ka\hs, " beautiful," and fla^aros, "a shrub." 



CALLITHAMNION Daviesii. — Fronds very minute, closely tufted, or 

 forming a continuous stratum on the surface of other Algse ; filaments 

 much branched ; branches scattered, slightly curved, distant, having a 

 few secimd or alternate, subulate, scattered ramuli, furnished with three 

 to four short, secund ramella; collected on the upper edge and towards 

 the base of the ramidi ; tetraspores pedicellate, lateral on the axillary 

 ramuli. 



CALLITHAMNION Daviesil. — Lyngh. ITyd. Dan. p. 129, t. 41 ; Ag. Sp. Alg. vol. ii 

 p. 186; Harv. in Hooh. Br. Fl. vol. ii. p. 348 ; Harv. P. B. plate 314 

 Harv. Man. p. 184; Harv. Syn. p. 157 ; Atlas, plate 60, fig. 281 

 Harv. N. B.A. part 2, p. 243 ; Kiitz. Sp. Alg. p. 638 ; /. G. Agardh, 

 Sp. Gen. Alg. vol. ii. p. 11. 



Trentepohlia Daviesii. — Harv. in Mach. Fl. Hib. part 3, p. 219. 



Conferva Daviesii— Dilhv. Coiif. t. F ; £. Boi. t. 2329, 



Hab. — Parasitical on the smaller Algse, in pools and on rocks between tide-marhs. 

 Annual. Summer; autumn. Common. 



Geogr. Dist. — Atlantic shores of Europe ; North America. 



Var. /3. virgatulum. — Ramuli mostly from every joint, single-jointed, very 

 minute, secund or alternate. 



CALLITHAMNION virgatiilum. — Harv. in Hooh. Br. Fl. vol. ii. p. 349 ; Wyatf, 

 Alg. Danm. No. 189 ; Harv. P. B. plate 313 ; Harv. Man. p. 184 ; 

 Harv. Syn. p. 158 ; Atlas, plate 60, fig. 282 ; /. G. Agardh, Sjh Gen. 

 Alg. vol. ii. p. 12. 



CALLITHAMNION Davicsii, var. — Harv. Man. 1st edit. p. 117. 



IIab. — Parasitical on the smaller Algae, and likely to be found where C. Daviesii is 

 met with. 



Geogk. Dist. ? Likely to be the same as C. Daviesii. 



Description. — Fronds veiy minute, from one to four lines in length, 

 fomiing densely pulvinate tnfts or more or less widely spreading strata 

 on the surface of other Alga), hardly apparent except from the brighter 

 colours of the mass ; filaments capillary, cylindrical, much branched; 



VOL. It. T> D 



