M. FOSLIE. [1899 



It has generally been supposed, that the above plant as under- 

 stood by CroLian was to be considered identic with the spedes 

 recorded by Falkenberg under the name af Melobesia caUUham- 

 nioides. However, so is not the case. Crouans plant of which 

 I have seen an authentic specimen, is not any calcareous alga. 

 The specimen agrees tolerably well with the quored figures in Ann. 

 SC. natur., and appears, as far as examined, to be creeping fila- 

 ments of a young Wwclochorton. The threads are 8 — i2/J.thick. 

 I have also seen one or two of the circular formations delineated 

 in Fl. Finist. pl. 20, gen. 131, fig. 2, but they do not represent 

 any alga, at least not in the specimen that 1 have seen. They 

 appear to be an animal, somehvvat like a Rhizopode. 



Hapalidium roseum Crn. 



Fl. Finist. p. 140; excl. syn. 



= Melobesia zonalis (Crn.) Fosl.? 



I have not seen any specimen of the above species from 

 Crouan"s hands. Being incllned to consider also this plant identic 

 w^ith M. zonalis, I judge more from the substraium 1. c. than from 

 any other support for the determination, as Crouan does not give 

 any description himself but only refers to Ktitzing wit regard to 

 this as yet rather uncertain species. 



The plant that Rosanoff mentions under the name of Melo- 

 besia rosea (KQtz.), and considers as a rather uncertain species, 

 seems not unlikely to be identic with Litliothamnion corticiforme 

 (Klitz.). Through the kindness of Dr. Le Jolis I have had the 

 apportunit}' to examine an authentic specimen, or a tew very small 

 crusts on Bornetia secundifiora from Cherbourg. The type of J/. 

 rosea has been found on Bryojjsis Lamouroiixii (Balhisiana) in 

 the Adriatic. Cp. Klitz. Spee. Alg. p. 695, and Tab. Phyc. 19, 

 p. 33, t. 92. The said specimen almost fully agrees wit L. corti- 

 ciforme, being as in the latter composed of a number of minute 



. -' Gil;i'S.ts which soon become fully confluent. In comparing it with 



■.•:... ,'i^QLBigspecimens of this species, the cells are, seen from above, 

 p .^^^ecgiséfttly only a little smaller, but they are i-ather varying as_ 





,.-/ 



