2-ti ALGOT.OGIAE MARIS I.IGUST1CI SPECIMEN 



CYSTOSEIRA Grevill. Alg. brit. p. xxxu. 



5. Cystoseira ericoides Agard. Spec. Alg. i. p. 52. Syst. p. 281. Drsv 

 Hoi. gall. p. 937. Montagn. Crypt, alger. (in Ann. ties scienc. not. 

 ■vol. 10.) p. 378. 



Pcctiia EniCA naiiika Bertol. Hist. Fuc. Lig. p. 288- 



Ail rupcs submcrsas in litore genuensi frequens. 



4. Cvstoseira squarrosa DNtrs. 



Nicacae ad rupcs maris ictu pcrcussas rara. 



Frons, e callo radicali mediocri, sinuoso, irregnlariter ramosa, cae- 

 spitosaque, decimetra duo circitcr longitudinc aequans, ramis angulosis 

 valde flcxuosis, confertis, fastigialisvc, ramulis summis rcliquis crassio- 

 ribus. Folia approximata , solitaria, gcminataque, inferiora aeuleiformia, 

 brevia, superiora conferliora apice dilatato-explanala , subindc angulosa, 

 subcostata, palmatim bi-tri-quadridenlata, dcntibus acutis, truncatisve. 

 Conceptacula ovata, globosa, didymavc basi foliorum supcriorum innata, 

 poris ellipticis, rotundisve pertusa. Sporae obovato-truncatae, limbo 

 pellucido cinctae , paraphysibus numerosissimis , liliformi-articulatis ob- 

 rallatae, c pariele conceptaculorum interna ortum ducentes. 



Platlta pulchra, foliorum denlibus siecitate rigidissimis horrida, recens 

 olivaceo-fuscescens, siccata fusco-fuliginea. 



Vai-iat frondibus parcius raraosis, ramis subbifariis palentibus. 



Affinis Cjstoseirac sedoidi ct ericoidi, praesertim dispositione folio- 

 rum et conceptaculorum, ab utraque vero dislinguitur foliorum forma, 

 quae in omnibus adductarum specierum mihi comparatis speciminibus, 

 binata vel solitaria, sed eximie et constanter subulata; insuper babitu 

 prorsus peculiari , rigiditate, ramorum crassitic, statura etc. 



Fucus comicidatus Wolf. ( Crypt, aquat. in Rocm. Arcbiv. 3. p. 52. 

 n." 29.) propemodum buic speciev accedere videretur foliolis planis aut 

 plano-compressis apice cornuto-bifidis subtvijidisve , si foliola decurrentia, 

 nude fiondes, mcmbranula prominenti suljdiaphana, alatae evadunt, non 

 liaberet 



