198 ALG.E RHODOSPERME^:. [Chylodadia. 



43. LAURENCIA. Law/war. Laurencia. 



Frond cylindrical, filiform, between gelatinous and cartilagin- 

 ous, mostly yellowish or purplish-red. Fruct. of two kinds : 

 1. ovate capsules with a terminal pore, containing a cluster 

 of stalked, pear-shaped seeds, fixed by their base; 2. ternate 

 granules, imbedded in the ramuli. Grev. Named in compli- 

 ment to a French Naturalist, M. de la Laurencie. 



1. L. pinnatifida, Lamour. Pinnatifid Laurencia. Frond 

 compressed, cartilaginous, bi-tripinnatifid, divisions alternate, 

 ultimate ones obtuse, simple or lobed. Hook. Br. Fl. v. ii. 

 p. 296.Fucus pinnatif. Turn. Hist. t. 20. E. Bot. 1. 1 202. 

 /3. Osmunda ; frond flat, simple; ramuli short and multifid. 

 Turn. 1. c. 7. angusta ; frond roundish; branches multifid ; 

 ramuli terete, thickened upwards. Turn. I. c. 



Rocky shores, very common. 1 10 inches high, dull purple. 



2. L. obtusa, Lamour. Obtuse Laurencia. Frond cylindri- 

 cal, filiform, 2 3 pinnate; pinnae mostly opposite; ramuli 

 short, patent, obtuse. Hook. Br. Fl. v. ii. p. 296. F. obtusa, 

 Turn. t. 21. E. Bot. t. 1201. 



On the larger Algae, rare. Ireland's Eye ; Mr. R. Ball. 



3. L. dasyphylla, Grev. Thick-leaved Laurencia. Frond 

 filiform, terete, much branched, vaguely pinnated ; branches 

 long, subsimple, set with irregular, scattered or subfasciculate, 

 obtuse ramuli, much attenuated at the base. Hook. Br. Fl. 

 v. ii. p. 296.Fucus dasyphyllus. Turn. t. 22. E. Bot. 

 t. 847. 



On sand-covered rocks and the larger Algae, not rare. Bantry bay ; 

 Miss Hutchins. Coast of Clare ; W. H. Harvey. Colour a pale 

 pinky-brown. 



4. L. tenuissima, Grev. Slender Laurencia. Frond fili- 

 form, much branched in a pinnated manner ; ultimate branch- 

 lets short, setaceous and attenuated at the base. Grev. Ala. 

 Brit. t. 113. Gigartina tenuiss. Lamour. Chondria tenuiss. 

 Ag. Sp. Ala. v. i. p. 353. Fucus tenuiss., Good, et Woodw. in 

 Linn. Trans, v. iii. p. 215. t. 19. Turn. Syn. Fuc. p. 35, Hist. 

 Fuc. t. 100. E. Bot. t. 1882. 



On rocks and on the larger Algae. On the Coast of Waterford, 

 near Ballycotton ; Miss- Sail. 0. Summer. 6 8 inches high. 

 Readily distinguished by its very slender, uniform, ultimate ramuli or 

 pinnules. 



44. CHYLOCLADIA. Grev. Chylocladia. 



Frond cylindrical, filiform (often constricted as if jointed), be- 

 tween gelatinous and cartilaginous, of a pinky-red colour. 



