Aiialccta A l"()l()o;ii;i. 



(,^U()(1 attinet i|)Sii or^'aiia IVaetilicatioiiis, satis constat luce obsoi'vati(jiiil)iis i 



recentiorum et ic()nil)us pulcheriniis ita illustrata fuisse, ut nec de structura, 

 ncc (le significatione divorsoruni orgaiioiimi duhia qasedam liodie reslarent. Cum 

 [lis coniparanti inilii ()l)servationes a ]):iia (îviflitlis oliin tactas, de (|uil)us in 

 speciminibus distributis ipsa nicntionem feeit, et (piibus l'ultus K. I\. Greville 

 organa fructificationis Dictyotarum quoqiie descripsit, ha' quideui iii j)luriinis 

 cum receiitioribiis congruentes adparuerunt. Attanieu aiiimadvertere placet 

 lias observationes quodam respectu difi'erre; (piod jam ex modo, (pio lue- 

 morantur organa diversa, facilius patet. Organa nimii'um tli versa sequenti 

 modo describuntur. 



l:o. "Capsules single, prominent when ripe (Grif. in specini.); ""On some 

 plantxS ovate solitary scattered blackish seeds"' (Grev. Alg. Brit.) -~= Te- 

 frasporcp Thuret. 

 2:o. '"Spécimens covered witli minute trans|)arent vesicles, prominent on both 

 sides, which do not contain seeds ■''(Griffifli iu spec.J — On othei' spéci- 

 mens arc numerous minute vesicles on both sides of- the frond, similar 

 I présume to those alluded to in Engl. Botan. They do not appear to 

 be at ail connected with the fructification, though when in a young state 

 the seeds sometimes happen to be included by them.'" (Greville I. c.) =-- 

 Antheridia. Thuret. 

 3:p. "At first vesicles scattered over the frond, which in time are filh^l with 

 gi'oupes of capsules (the latter mode very rare)" Griff. in spec. On 

 other (plants) seeds collected into little dense scattered roundish clusters" 

 GrevilJ. l. c. = Sporœ in soros collectœ T/niretii. 

 Animadvertere placet Thuretium docuisse hœc organa omnia a cellulis 

 corticalibus transmutata oriri. Greville vero expressis verbis statuit organa 

 démuni emersa obvenire, ruptura facta membranie exterioris '). Si qais cre- 

 deret Orevilleum cum niembrana exteriore ruj)ta tantum cuticulam quandam 

 totius frondis intellectam voluisse, animadvertere placet, ejusmodi explicatio- 



esent, pbst delapsum sori persistentes. Thuret et lîeinke, si illos rite interpretatiis suin, 

 eadem semper antlieridiis pr.Tgnantia assumserunt. Veteres Algologi Angliœ pustulas qui- 

 flem iiuijori sollertia descripserunt modo a me iiifra mox niemorato. 



' ) Both kiuds of seeds) l>ursting tlirongh tlie epidermis and becomiug at leugtli pro- 

 miiieiit A(g. Brit. p. 58) de iJictyoia dldiùtoma. et p. 57 de Dictyotœ Génère: Tlie 

 seeds in most cases are produeed beneath the epidermis through which they burst and 

 hecoiiie ])roniineiit Alif. lirit. p. 4(> l)e Dicfyoteis. 



