Tolysiplionia. UuuDOMELEiE. ' 095 



lecta, *t species longe diversa, siphonibus 4 pericentralibus latis in- 

 structa, extus vero corticata. Cuinam hsec pertineat ex speciminibus 

 a me examinatis Eegre dicitur- an P. vestitee forma esset major et 

 eximie evoluta atque cortice densiore obducta, ulterius inquirendum 

 esse mihi adparuit. 



9. Spinulos^ caulescentes, ohsitce ramnlis juventute pltis mi- 



nus peniciUatis demum rigidiusculis suhtdatis simpliciusculis. 



— Atlanticce et marium adfl,uentium incolw. 



69. P. ARACHNOiDBA (Ag. Bot. Zcit. 1827 p. 638) elongata, a 

 basi articulata ecorticata, filis inferne crassiusculis livido 

 et purpureo variegatis, superne tenuissimis roseis dicho- 

 tomo-deeompositis raniellisque patentibus multo tenuioribus 

 virgatis, ramellis elongatis simpliciusculis, juvenilibus dense 

 fibrilliferis, articulis 4-siphoniis, mediis 3-plo — 4-plo, ra- 

 mellorum duplo diametro longioribus, sphffirosporis in ra- 

 mellis torulosis seriatis, keramidiis ovatis pedicellatis. 



a. ARACHNoiDEA ramis sursum attenuatis tenuissimis, fibris pa- 

 rum conspicuis. 



Hutchinsia arachnoidea Ag. h c. S}). Alf). p. 88 (excl. var.). 



b. MELAGONiUM ramis sursum minus attenuatis fibrilliferis. 



Pol3'siplionia Melagonium Menegh. giorn. bot. 1844 p. 302. KiiU. 

 Sp. Alg. p. 835! 



Hab. in mari adriatico ad Venetiam (Ruchinger!); ad oras 

 Dalmatiffi (Titius! in Hb. Lenormand); in mediterraneo ad Mas- 

 siliam (Giraudy!). 



Frons a plexu radicali surgens usque sex-pollicaris et inferne 

 seta crassior, sursum maximopere attenuata, vix capillaris, tamen inde 

 a basi articulato ecorticata, in inferiore parte fere livida geniculis pur- 

 pureis variegata, in superiore roseo-coccinea. Rami clongati dicho- 

 torai, phis minus decompositi, insuper ramcUis lateralibus virgati. 

 Ramelli iilo, a quo egrediuntur, multo tenuiores, patentes aut immo 

 patentissimi, ahi !)reviores simpliciusculi, alii valde prolongati parce 

 divisi, in ramos excrescentes* juveniles eximie fibris a tota superiore 

 parte provenientibus penicillati; adultiores nudi, longissime attenuati 

 molles, spliserosporas foventes vix conspicue tlexuosi at eximie toru- 

 losi in parte infra-terminah fertih, inferiore parte longiore squah. 

 Keramidia pediceUo evidenti sutTuha, sat magna, ovata. Articuli in 

 tota planta conspicui, infimi ramorum principahum breves, diametro 

 circiter a^quales, sursura sensim longiores diametro 3-plo vix 4-plo 



IV. 66 



