Analecta Algologica. - 55 



Qiiod attinet ipsa Organa fructificationis, satis constat hfpc observationilms 

 recentioriim et iconibus pulcherimis ita illustrata f'uisse, ut nee de structura, 

 nee de significatione diversorumorgauorum dubia qua^dam liodie restarent. Cum 

 bis comparanti mihi observationes a Dnia Griffitbs olim facta«, de quibus in 

 speciminibiis distributis ipsa nientionem feeit, et quibus fultus R. K. Greville 

 Organa fructificationis Dictyotarum quoque desci'ipsit, hte quidem in plurimis 

 cum recentioribus congruentes adparuerunt. Attamen animadvertere placet 

 has observationes quodam respectu differre; quod jain ex modo, (luo me- 

 morantur Organa diversa, facilius patet. Organa nimirum divorsa sequenti 

 modo describuntur. 



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

 plants ovate solitary scattered blackisli seeds"' (Grev. Alg. Brit.) = Te- 

 trasporcB Thuret. 

 2:o. "Specimens covered with minute transparent vesicles, prominent on both 

 sides, which do not contain seeds ''(Griffitli in spec.J ~ On other speci- 

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

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

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

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

 Äntheridia. Thuret. 

 3:o. "At first vesicles scattered over the frond, which in time are filled with 

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

 other (plants) seeds collected into little deuse scattered i'oundish dusters" 

 Grevill. l. c. = Sporte in soros collectcR Tlmretii. 

 Animadvertere placet Thuretium docuisse hgec organa omnia a cellulis 

 corticalibus transmutata oriri. Greville vero expressis verbis statuit Organa 

 demum emersa obvenire, ruptura facta membranfc exterioris '). Si qais cre- 

 deret (jrevilleum cum meinbrana exteriore rupta tantum cuticulam (juandara 

 totius frondis intellectam voluisse, animadvertere placet, ejusrnodi explicatio- 



eseiit, post flelapsuni sori persistentes. Thuret et Rpinke, si illos rite interpretatus suni, 

 eadem semper antheridiis pra^gnantia assumseruiit A'eteres Algologi Anglis' pustulas qui- 

 dem majori sollertia desciipserunt modo a me infra mox memorato. 



') Both kinds of seeds) l)urs(ing tlirongh the epidermis and becoming at leugth pro- 

 minent Alg. Brit. p 5S) de Divtyoiu dicltotoma. et p. 57 de Dittyota' Genere: The 

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

 become prominent Ahi. Brit. x>. 46 Be Dictyoieis. 



