62 One Thousand Objects 



barren threads (paraphyses) are clubbed at the tips. (PI. 

 VI., fig. 9.) 



The following sea-weeds (Nos. 444 10463) are marine: 



444. TETRASPORES (Chrysomena rosea). Four spores 

 united together into a globose body is the usual form of 

 fruit in the red sea-weeds. Three spores only are visible 

 in any position. (PI. VI., fig. 10.) 



445. WRACK SPORES (Fucus vesiculosus). In the com- 

 mon sea-wrack the egg-shaped spores are mixed with 

 barren threads or paraphyses in receptacles at the tips of 

 the fronds. (PI. VI., fig. 42.) 



446. COMMON CORALLINE (Corallina qffidnalis). 

 Every little pool amongst rocks on the sea-shore has tufts 

 of this coralline, which is also known upon the beach in 

 rough weather, and soon becomes bleached to a chalky 

 whiteness. (PI. VI., fig. 40.) 



447. TETRASPORES IN SITU (Ceramium strictuui). The 

 tetraspores in this genus are usually imbedded in the 

 branches at regular distances, and in bands around the 

 branch. In this position they alternate with the spines 

 in the spinulose species. (PI. VI., fig. 41.) 



448. BLADDER WRACK (Fucus vcsicnlosus). The spores 

 are borne in receptacles at the tips of the fronds in this 

 very common species, and are mixed with the jointed 

 and branched barren threads, or paraphyses. (PL VI., 

 fig. 42.) 



449. STEM OF SEA WEED (Polysiphonia affinis). 

 Although this is not one of the commonest species, it 

 affords a very good example of the kind of structure to 

 be met with in sections of the stem of some of our sea- 

 weeds. There is, however, a great variety in the cell 

 arrangement in different species. (PI. VI., fig. 43.) 



450. WHORLED WRANGELIA (Wrangelia multifida). 

 The branches of this elegant sea- weed are very elegant, 

 with its whorls of slender branched filaments. Not un- 

 common in tide-pools on the South Coast. 



451. SHORE CONFERVA (Ectocarpus litoralis). One of 

 the commonest parasites on larger Fuci all around the 



