32 R- Gronblad, New Desmids. 



ordinatis composita. Long. 103—120. lat. 80—99, crass. 

 53—57, isthm. 32—38 ;<. [N:o 938]. 



It seems to me as if var. suecicum Borge (in Ark. i. 

 Bot. vol. VI pi. 3 f. 31 page 40—41) and var. italicum Ra- 

 cib. (Nowe Desm. pi. 6 f. 1), as well as our form, differ 

 only very slightly from the type. The median tumidity, the 

 smooth area, and the arrangement of the granules and 

 scrobicules are subject of a considerable individual varia- 

 tion. I do not think it possible always to distinguish be- 

 tween the above forms. 



Hab. Messuby (W); Kimito (SW), leg. H. Waren. 

 PI. 6 fig. 40—42. 



C. malinvernianum (Rac.) Schmidle, Virnheim p. 58 

 (Syn. ==C. subtholiforme Racib. Nowe Desm. pi. 5 f. 40). — 

 Long. 61, lat. 53—54, crass. 32—35, isthm. 17 u. [N:o 974]. 



In West's Monograph (vol. Ill p. 199) this species is 

 regarded merely as a synonym of C. margaritiferum M e- 

 negh., although not with certainty. Also C. malinvern. 

 var. badense Schmidle, 1. c. pi. 7 f. 21 would, according 

 to West, be identical with C. margaritiferum (1. c. page 

 201 — 202). On this point I cannot agree with these authors, 

 as in my opinion C. malinvernianum is apparently quite a 

 different species with characteristic features. It is to be 

 desired that the original specimens of Schmidle or R a- 

 c i b o r s k i were examined. C. malinvernianum is distinguish- 

 ed by l:o) longer and more conical granules which become 

 reduced at the centre of the semicells (whereas the central 

 granules of C. margarit. are larger); 2:o) the scrobiculated 

 central area is larger and the scrobiculations of a triangular 

 shape; 3:o) in vertical view the apex is smooth (as by 

 C. margarit.), but it is possible to see that in front view 

 the marginal and submarginal granules are conspicuously 

 arranged in 3 parallel series (this character is never present 

 in C. margarit. but is quite evident in the figures of R a- 

 c i b o r s k i and Schmidle); 4:o the outline in front view 

 is not identical because the lateral margins are less con- 

 vergent and the apex broader, thus causing a difference in 



