Sphacelaria.] ALG.fc CONFERVOIDEJ*. 3*23 



regularly whorled imbricated mostly simple — Ag. Sp. Alg. v. 2. 

 p. 12. — Conferva spongiosa, Dillw. Conf. t. 42. E. Bot, t. i2427. 



/]• 



On rocks, &c, in the sea, common. — Smaller than the last, with 

 denser and more imbricated ramuli, and less divided and more clumsy 

 branches. The ramuli are often forked. 



57. Sphacelaria. Lyngb. Sphacelaria. 



Filaments jointed, branches distichous, rarely dichotomous, 

 rigid. Fruit double, on the same individual; — 1. ovato-spha?ri- 

 cal capsules, furnished with a terminal pore: 2. a granular mass, 

 inclosed in the hyaline vesicated apices of the branches. — Name 

 from ZpoMzXo',, gangrene; aptly expressive of the withered, dis- 

 tended apiees. 



* Filaments stuppose (beset with woolly fibres) at the base or 

 lower part. 



1. S.filici?ia, Ag. (Ferny Sphacelaria); stuppose at the base, 

 branches lanceolate decomposite pinnate, pinnae alternate, pin- 

 nules fascieulato-multifid. — Ag. Sp. Alg. v. 2. p. 22. — S. hyp- 

 noides, Grev. Crypt. Fl. t. 348. 



In the sea, very rare. — Plymouth (1822), Mr. Sconce. Ilfracombe, 

 Mrs. Griffiths (1823) and Mr. Hare. Whitsand Bay, Mr. ArnoU. 

 Brighton, Mr. Borrcr. — Greville's plate is admirably characteristic of 

 British specimens ; but foreign ones are much larger and more branched, 

 with a good deal the habit of S. disticha. Mr. Boner's have the 

 branches and pinnae very much divaricated, and the pinnules less finely 

 cut than is usual. 



2. S. scoptiria, Lyngb. (broom-like Sphacelaria); lower part 

 stuppose and shaggy, upper branches broadly fasciculate rigid 

 pinnate, pinna? Simple short spine-like alternate erect. — Lyngb. 

 Hydroph. Dun. p. 104. /. 31. Ag. Sp. Alg. v. 2. p. 19— Con- 



f( rru senna rui, Dillir. ( 'onf. t, 52, /:'. />'"/. t. I 552. 



In the sea, not uncommon in roan} places. — "J — 6 inches high, harsh. 



:). S. disticha, Lyngb. (shaggy-pinnated Sphacelaria); stop- 



po>e at tin- base, much branched, secondary branches pinnate, 

 pinna erecto-patent Bubnlate alternate, the lower ones slightly 

 <li\ided. — Lyngb. Hydroph. Dan. p. 104. /. 31. Ag. Sjp. .//'/• 

 r. -2. p. l'<;. 



South coasl <»i' England, not rare? Firth of Forth. Dr. Greville. — 

 8 — .i inches high, somewhat rigid; >tems rising from a densely matted 

 stuppose base, composed of woolly fibres, which also clothe their lower 

 part, though in a much l< than in 8. icoparia. Branches long, 



erect, springing near die mot and undivided, except at the top where 

 tiny are often fasciculate, beset with Bhort secondary branches or M plu« 

 mules," which are once or twice pinnate. Colour greenish-olive. Spha- 

 imall, truncate. — Often confounded with 8. phnu om and 



though more nearU allied to S./i/wina. 



