Conjugat;v, Desraidiacete, Cosmariura. 991 



n. 396. — Submediocre, suborbiculare, diametro septinia parte lon- 

 gius, 41 » 38, profundissime constrictum, sinu lineari extrorsum 

 vix ampliato, isthmo 10-11 a. lato, 24 //. crass. : semicellulis se- 

 micircularibus, medio dorso subtruncatis, margino ventrali sub- 

 recto, angulis inferioribus subrectis, paullum incrassatis, ad isthraura 

 verrucula pneditis, in parte superiori seriebus binis transversis, 

 leviter armatis, altera subdorsuali 3 verrucularum, altera subme- 

 diana 5-6 verrucularum ornatis; a vertice conspectis ellipticis,. 

 medio utrinque verruculis 5-6 et intra margines laterales ternis 

 munitis, a latere circularibus, utrinque verruculis 3 instructis; 

 membrana distincte punctata; pyrenoidibus binis. 



Hab. ad « Rergsbrunna » in Uplandia, ad a BoUtorp » in Ostro- 

 gothia, ad a Unnaryd, Femsjo, Rappe » in Smolandia Suecia? (Lun- 

 dell), ad (( Harrachsdorf etc. )) in Bohemia (HansCtIRg), ad (( Abo, 

 Kaskerta, Nadendal, Karkku » in Fennia (Elfving), in America 

 boreali (Wolle). — Var. bidentulum Lagerh. Bidrag till Ameri- 

 kas Desmidie-Flora p. 237, t. XXVII, f. 8: subcirculare; se- 

 miceliulis ad isthmum verrucula magna praeditis in parte superiori 

 serie subdorsuali, leviter arcuata, 5 verrucularum, in parte raedia 

 4 verruculis, subcruciatim dispositis, munitis; a vertice visis ellipti- 

 cis, paullulum acuminatis, angulis bidentatis; a latere visis sub- 

 circularibus, utrinque 4 verruculis instructis; raembrana subtiliter 

 punctata. Ad (( Tewksbury » Massachussetts Americse borealis. Dim. 

 cell. 48 := 45 p.., crass. cell. 24 f/„ lat. isthm. 10 u.. — Var. sub- 

 undatum Boldt Sibir. Chloroph. p. 101, t. 5, f. 4: minus, tam lon- 

 gum quam latum, lateribus levissime 4-undulatis; semicellulis se- 

 riebus binis transversis subrectis, altera subdorsuali 2 verrucula- 

 rum, altera mediana 3 verrucularum ornatis; a vertice conspectis 

 ellipticis medio utrinque verruculis 3 et intra margines laterales 

 verruculis binis instructis; membrana distincte punctata. Ad (( Tujq- 

 guska )) Sibirise. Dimens. 27,6-26-4, lat. isthmi 7s2 w., crass.. 

 16,8 [j. — Var. lithuanicum Racib. Desra. lituan. in Notarisia 

 1889, p. 661 : parvum, subcirculare, fere seque longum ac latura 

 vel paullo longius, incisura mediana profunda angustissima vel 

 angulo acutissimo ampliata ; merabrana semicellularum glabra, sub 

 dorso verrucis 4-5 in seriem unam ordinatis, supra basin verruca 

 unica iastructa ; semicellulis subsemicircularibus, angulis basalibus 

 (a fronte) in verrucam parvam incrassatis, margine integerrimo; 

 a vertice visis ellipticis, polis truncatis, angulis verrucis parvis 

 ornatis, lateribus medio 3-crenatis, crenis humilibus vix conspi- 



