194 D'' GooDENouGH an J Mr. WoodwardV Ohfervdlions on 



p. 24. «. 2. — Pet'ivei-, p. 35.* «. 2. Uvedcile, p. 6. n. 4. R. Syii, 

 p. 43. «. 3. F/. D(;«. /. H21. L/'««. ;5)J. /-"/./. 1 631. Fl. Aig. 

 /. 587. F/. Scot.p. Cf6^. lVithcr'mg,vol.2'p-iS'^- 

 Habitat in rupibiis ct I'axis marinis apud Cromer in Norfolciu 

 & alibi frequens. 



Ra(]ix callo minimo cxpanfo — Frcns rimpliciflinia, frepius conftrta, 

 aliquando foljtaria, filifonnis. teres, glabra, craflitic penna: corvina:, 

 ad duarum vel trium ulnarum longitudinem fepe extenditur; bafi 

 apiceque attenuato, cetera uniformis — Subjiantia membranacea eC 

 fubfragilis, fiftulofa, conftantcr cavaabrquemedulla — Annuli plurl- 

 mi per totam cavitatem irrcgiilarlter pofiti, confervarum fepta jemi!- 

 lantes.vifi iunt— Cc/tr recentls plants olivaceo-viridis^ficcatae niger — 

 FruSiifcatlo incognita. 



This fpecies differs from all other Fwc/ in habit, and has been fup- 

 pofed by fome authors to belong more properly to the genus Confer- 

 va, from having the appearance of tranfverfe fepta or diaphragms 

 through the whole length of the frond. On holding the plant to the 

 light, it will however be obferved that thefe apparent fepta are 

 placed at unequal diftances, are frequently obliqise, and that there 

 are no correfponding contra£tions vifible on the exterior furface ; 

 in all which particulars it differs from the Conferva. If the recent 

 plant be differed longitudinally, and examined with a glafs, it 

 will be found, that inftead of fepta thefe are merely rings formed 

 on the internal fubftance of the tube, and that no diaphragms what- 

 ever can have been connedted with them, as they are uniform, and 

 covered with a flight wooUinefs exadlly in the fame manner as the 

 reft of that furface. They do not appear to contain the frudtifica- 

 tjon, and may perhaps be intended only to ftrengthen the plant, 

 and to enable it the better to maintain its round and tubular form. 



We 



