Analecta Algologica. 315, 
Quod attinet 1psa organa fructificationis, satis constat hee observationibus 
recentiorum et iconibus püleherimis ita illustrata fuisse, ut nec de structura, 
nee de significatione diversorum organorum dubia quaedam hodie resiarent. Cum 
his comparanti mihi observationes a D:na Griffiths olim factas, de quibus in 
speeiminibus distributis ipsa mentionem fecit, et quibus fultus R. K. Greville 
organa fructificationis Dietyotarum quoque deseripsit, he. quidem in plurimis 
eum recentioribus congruentes adparuerunt. Attamen animadvertere placet 
has observationes quodam respectu differre; quod jam ex modo, quo me- 
morantur organa diversa, facilius patet. Organa nimirum diversa sequenti 
udo deseribuntur. | 
1:v. "Capsules single, prominent when ripe (Gvff. in specim.); "On some 
plants ovate solitary seattered blackish seeds? (Grev. Aig. Brit.) — e- 
traspore T'huret. 
29:.. "Specimens covered with minute transparent vesicles, prominent on both 
sides, whieh do not contaim seeds "(Griffith ?m spec.) — On other speci- 
mens are 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 staté 
the seeds sometimes happen to be included by them." (Grevilie l. c.) — 
Antheridia. — Thuret. 
3:0. "At first vesicles scattered over the frond, which in time are filled with 
groupes of capsules (the latter mode very rare)" Griff. im spec. On 
other (plants) seeds collected into little dense scattered roundish-*clusters" 
Grevill. l. e. — Spore in soros collecte duet. 
Animadvertere placet "Thuretium docuisse hec organa omnia a cellulis 
eortiealibus transmutata oriri. Greville vero expressis verbis statuit organa 
demum emersa obvenire, ruptura facta membran exterioris !) $i qais cre- 
deret Grevilleum eum membrana exteriore rupta tantum cuticulam quandam 
totius frondis intellectam voluisse, animadvertere placet, ejusmodi explicatio- 

esent, post delapsum sori persistentes.  Thuret et Reinke, si illos rite interpretatus sum, 
eadem semper antheridiis przgnantia assumserunt. Veteres Algologi Anglie pustulas qui- 
dem majori sollertia descripserunt modo a me infra mox memorato. 
') Both kinds /of seeds) bursting throngh the epidermis and becoming at leugth pro- 
minent A/g. Brit. p. 58) de JDictyota dichotoma. et p. DY de Dictyote Genere: The 
seeds in most cases are produeed beneath the epidermis through which they burst and 
become prominent Aig. Brit. p. 46 De Dictyoteis. 
