Cosmarium tortum Lagerh. & Nordst.

%

HER&4/Ì

Cotaa

^y*nb\

SYNTYPE OF:	4tr^~VVv\	4

!* bJ-'Krock-, Mtdihjl- cud	^I-, Mài. l?Cl-' ¡31?.

m

'herba^7^v

CO|‘UMa/A

6RS1TV

Wittrock, Nordstedt, Lagerheim. Algae exsiccatce.

^ ^AtBBART¿7^-
. -COLUMBIA
^^VERSH^

1486. Cosmarium tortimi Lagerh. et Nordst., nov. spec.

C. parvum diametro paullo longius, medio parum constrictum sinu
nullo; semicellulse obtrapezicse lateribus paullulo convexis, angulis (supe-
rioribus) obtusis, apice truncatse vel int^rdum late excavatai, a latere
semiellipticse, e vertice late ellipticse, subalternantes. Long. 16—20 /u,
lat. 14—17 /u. crass. 10,5 /u1 lat. isthm. 10—11 ¡a.

A fronte habitu Staurastri corniculati non dissimile, sed multo
minus angulis non tam porrectis, a Staur:o (Arthrod.) psilosporo de-
fectu aculeolorum diversum, a Cosmario bicuneato longitudine prse
latitudine majori et apice non convexo differt; a Cosm. helcangulari
et Cosm. coarctato defectu sinus; a Cosm. arroso longitudine majore
et tumore parvo nullo; a Cosm. arctoo apicibus non convexis differt;
ab omnibus his semicellulis subalternantibus.

Secundum Haupffleisch Zellm. u. Hüllgall. Desm. p. 124 (66) cel-
lula? omnium Desmidiacearum plus minus (vulgo levissime) tortse sunt;
inter Staurastra et genera filamentosa form se radiis vel angulis semicellu-
larum alternantibus non rare occurrunt, sed tam multum tortum Cosma-
riunì antea vidi nullum.

P^xplic. fig. (circ. 800/1).
1—7, cellulse, cujus semicellula
supera plus minus a fronte
visa est, infera plus minus
(in 7 exacte) a latere ; 8,
cellula a vertice visa In 3
nuclei amylacei delineati.

Suecise in stagno turfoso
ad Fjellnäs in regione subal-
pina Herjedalise 18 ls/7 97.

Gr. Lagerheim.

r-		Tl
	\ \	& )
2\_^		-_
	w	J

NEW YORK BOTANICAL GARDEN

01

92642

01192642