chymaticus, capillaris, iiliformis, nunc simplex, nunc rn- 

 mosus, frondostis 1. incmbrnnnccus. Pcrigonidia in (hallo 

 inimcrsa, rarius cxtcrna , spli;er!ca. Schizogonidia in cellu- 

 lis ilialli paruin mutatis evuluta, mobiiia. 



LVI. PORPHYRA A,j. 



Tkallus purpurasccns 1. coccincus, frondosus, mcmbrann- 

 ccus, unico cellularum strato constructus. PcrigonSdia immcr- 

 sa, divisiouc nuclei intus schizogonidia immobiiia gignentia. 



Grnus, in pracscnti rei phycologicae slain, ccrtc HI vis, 

 ncque, ut volnil ///'/:///</, Florideis appropinquandum. Scd 

 proptcr nuclei in Perigunidiis interdum quatcrnariam divtsionem, 

 co minus ad Florid eas referri potest, quod luc nucleus divisionc 

 quinaria, iinmo scptinaria, in plura qiiam quattuor schizogonidia 

 pcrsa?pe dividitur. Equidcm potissinuim credercm quaternuria ilia 

 divisione novas produci cellulus, nequc sehixogonidia, qua; con- 

 tra, ut puto, divisionc nuclei indetcrminata , quinaria, septinaria 

 etc., c\ triii ii I iir. ^ Species Ini jus generis null is characteribus lir- 

 mioribus circumscriptaB, fere oinncs habitu extcrno, uuitabili 

 semper et ancipiti, dignoscuntur. 



1. PORPBYRA LACiniATA 



Tballo purpureo I. \iolacco umbilicato gregario in lacinias 

 dilatatas undulatas varic fisso. 



Ulva umbilicalis Linn. Spec. ed. i. vol. 2. p. 1165. 

 Icnb. Lapp. p. 506. Lynyb. Utjdr. p. 28. 



Porphyra laciniata Ag. Syst. p. 190. 



