206 ALG^E RHODOSPERME^E. [Polysiphonia. 



4. P. Brodicei, Grev. Brodies Polysiphonia. Stems con- 

 tinuous, cartilaginous, alternately branched ; branches pinnated 

 with spreading pencillato-multifid, delicate, flaccid ramuli ; ar- 

 ticulations of the ramuli 3 4 tubed, rather longer than broad ; 

 dissepiments hyaline. Harv. in Hook. Br. Fl. v. ii. p. 328. 

 Conf. Brodicei. Dillw. t. 107. E. Bot. t, 2589. 



Rocky shores ; common on our western coasts. 



5. P. Lyngbyei, Harv. Lyngbyes Polysiphonia. Filaments 

 thick, cartilaginous, inarticulate, distantly and irregularly 

 branched, more or less furnished with long, slender, irregularly 

 dichotomous ramuli with acute axillae ; articulations of the ra- 

 muli 2 4 times longer than broad, bi-tri-striated. Harv. in 

 Hook. Br. FL v. ii. p. 328. Hutch, strictoides. Lyngb. Hyd. 

 Dan. t. 35. 



At Rosse's bay, North of Ireland ; Mr. D. Moore. 612 inches 

 high. Filaments as thick as those of P. elongata, inarticulate, marked 

 with flexuose veins, dull red. Ramuli long, bright crimson, few in the 

 winter state, but, as spring advances, abundantly clothing the upper 

 branches, and spreading in broad fascicles. To P. elongata this spe- 

 cies bears a very strong external resemblance, but the inarticulate 

 stems, and the long-jointed bistriated ramuli, which are, moreover, riot 

 in the least attenuated at the base, will always serve to keep it dis- 

 tinct. 



B. Filaments articulate throughout. 

 * Articulations marked with two stria. 



6. P. jibrata, Harv. Bearded Polysiphonia. Filaments 

 elongated, setaceous, gelatinous, bi-striated, flexuose, loosely 

 branched ; ramuli dichotomous, fasciculate ; axils patent ; upper 

 articulations 2 3 times longer than broad ; capsules ovate, pe- 

 dunculate. Harv. in Hook. Br. FL v. ii. p. 329. Conf.jibrata. 

 Dillw. 



Rocky shores. Bantry ; Miss Hutchins. Malbay ; W. H. Har- 

 vey. Portrush, black rocks ; Mr. D. Moore. 2 10 inches long, 

 very delicate, flaccid and gelatinous, forming loose tufts. Articulations 

 very variable in length. 



7. P. stricta, Grev. Straight Polysiphonia. Filaments 

 densely caBspitose, setaceous, flaccid, bistriate, dichotomous ; 

 branches and ramuli straight, erect ; axils acute ; upper articu- 

 lations 4 5 times longer than broad ; capsules ovate, sessile. 

 Harv. in Hook. Br. FL v. ii. p. 329. Conf. stricta, Dillw. 

 1*40. 



Rocky shores. Bantry ; Miss Hutchins. Black rocks, Portrush ; 

 Mr. D. Moore. A very confused species, which I regret I have no 

 opportunities at present of clearing up. Many distinct species appear 

 to be confounded under this name, both by authors and herbarists. 



8. P. macrocarpa, Harv. MS S. Large-fruited Polysiphonia. 



