Phaeozoospoi-iiijv, Lniniiifiriaocse, Lessonia. 363 



fonnis vcl ((lemuiii) rainosa; stipes ftraiicus) infernc sul)teres, uiox 

 eoui|)lanatus, superne planus, (licliotonie rainosus, ranuilis ultiiriis 

 laiuina.s g.Muinatas, llssura adscendente laniiuie simi^licis exortas 

 terniiuatis ; vesicuhe nuUae. Laniinaj plus uiinus lineari-ensiformes, 

 plan.ne ct erugosa}, niarginc glandulis sessilibus aut denticulis el(>- 

 vatis oruita^ adultie snepius integerrimne. Sporangia elongato-el- 

 lipsoidea una cuni pa,ra.physibus clavatis inarticulatis deuse stipatis 

 in media lamiua in utra^iue pagina versus basin maculas inagui- 

 tudinis iudet^^^rminata^ forniantia. 



1. Lessonia Suhrii J. Ag. Symb. I, p. 4, Sp. I, p. 150, Chordama gi^o 

 spicala Suhr in Flora ISJJO, p, 47, f. 41 !, Lessonia Berteroana 

 Mont. Yoy. Bonite p. 37, Cent. III, p. 20, n. 56, Kuetz. S}>. p. 

 582. — Stipite compresso, superne plano, decomposito-dichotomo, 

 segmentis iu laminas (folia) ipsis vix duplo latiores, lineares, an- 

 gustissimas, utrintjue attenuatas, margine late glandulosas abeun- 

 tibus. 



Hal). m ocea.no Pacifico ad littora Chilensia (Binder, Suhr, Hb. 

 ZANA.RDINIJ et Peruvianas (Parente, Grunow); ad « Tahiti » (Exp. 

 Novara), — Frons multipedalis, stipite inferne diametro fere 22 

 mm., teretiusculo, marginibus autem duabus superne saltim promi- 

 nulis, per dichotomias densissimas decomposito, segmentis sensiin 

 teuuioribus et magis compressis, ultimis planis vix 2,2 mm. latitu- 

 dine superantibus, apice in folium excurrentibus. LamiuEe 8-15 

 cm. longse, ad 4,5 mm. circiter lata? aut divisione nondum peracta 

 usqne 10-12 mm. lat:e, fere omnino lineares, apicibus angustatis, 

 margine denticulis glandulcTeformibus sessilibus, latioribus quam 

 elevatis, millimetrum latitudine a^quantibus, obsitee. Color e casta- 

 neo nigrescens. Hinianthalia Ditrinllmi Bory Voy. Co(|u. p. 135 

 a cl. Areschoug ad hanc trahitur. 



2. Lessoiia nigrescens Bory Voy. Coquille n. 4, tab. 5, Post. et noi 

 Paipr. Illustr. algar. pag. 2-4, t. IV et 39, f. 11 et 13, Hook c^ 

 Harv. Crypt. Antarct. p. 152, t. 1G7-168, J. Ag. Sp. I, p. 151, 

 Kuetz. Sp. p. 581, Aresch. Observ. phycol. V, p. 8, Laminaria 

 scissa Sulir in Act. Acad. Nnt. Curios. XVIII, suppl. t. I, Hohen. 

 Meeralg. n. 162, Aresch. Phyc. extraeur. exsicc. n. 57, Ljcssonia 

 Binderi Sonder, Laniinaria ramosissinia Lamour. et Chauv. teste 

 Kuetzing. — Stipite compresso, superne plano, decomposito-dicho- 

 tomo, segmentis in laminas ipsis multiplo latiores, lanceolato- 

 lineares. margine calloso-glandulosas aut inteeerrimas abeuntibus. 



