A REVISED LIST OF COLALLINJE. 9 



only for separating the above listed species from the section 

 Eucheilosjjorum . 



I am not inclined to discuss the question whether Arthro- 

 cardia is worthy of generic rank or not. Were the characters 

 of Arthrocardia important enough to elevate it to a genus, the 

 Marginisporum, the Alatocladia and the Serraticardia should be 

 equally mentioned as genera. But this is a matter of personal 

 preference. 



I was no less in doubt whether the two species, Amji. Wardii 

 and Amp. Mallardiœ, described by Harvey, should be legitimately 

 reckoned under the present section or not. We have no informa- 

 tion about the conceptacles of these species ; and I w^as not so 

 fortunate as to study authentic specimens. Judging, however, 

 from the original descriptions and Areschoug's notes, I ventured 

 to arrange them as above. They may have close affinity with 

 the Serraticardia. 



Arthrocardia palmata Aresch. seems to be unsatisfactorily 

 defined. Areschoug considers Cor. filicula Lamk. to be its 

 forma. But the latter belongs without doubt to the Alatocladia, 

 while the former has several characters allied to Amp. aberrans. 

 Grunow^^ remarks that Cor. flabellata KtJTZ. seems closely related 

 to Arth. palmata Aresch. As it is impossible at present to 

 study original specimens of these species, I must satisfy myself 

 with the references of these noted algologists. 



The genicula of Amp. aberrans are formed of single zones 

 of the periclinal cells. In explaining the fig. 5. pi. II. of " Cor. 

 ver. Jap.," I remarked that probably the geniculum was built 

 up with several zones. This was disproved after repeated closer 

 examination. 



1) Weltreise der Novara p. 79. 



