Náttúrufræðingurinn

Volume

Náttúrufræðingurinn - 1952, Page 44

Náttúrufræðingurinn - 1952, Page 44
88 NÁTTÚRUFRÆÐINGURINN Cocconeis placentula — scutellum var. parva Coscinodiscus (excentricus?) Cyclotella antiqua — Meneghiniana Cymbella aspera — affinis — cistula — cuspidata — helvetica — lanceolata — naviculiformis — sinuata — turgida — ventricosa Diatoma elongatum Diploneis interrupta (frag- ment) Epithemia sorex — turgida Eunotia flexuosa — pectinalis var. minor — praerupta Fragilaria bicapitata — brevistriata — capucina — construens — — var. binodis var. triundulata — intermedia — pinnata — virescens — — var. subsalina Frustulia vulgaris Gomphonema acuminatum ---var. coronata — angustatum — constrictum — longiceps var. subcla- vata(?) — olivaceum Hyalodiscus scoticus Hantzschia amphioxys Mastogloia pumila Melosira arenaria — italica subsp. subarctica — Juergensii — nummuloides — varians Meridion circulare ---fo. constricta Navicula cari — clementis — cryptocephala — halophila fo. capitata — lapidosa(?) — mutica var. binodis var. Cohnii — mutica — peregrina — — var. kefvingensis — perpusilla — pseudoscutiformis — pusilla — pygmaea — radiosa — rhynchocephala — salinarum — viridula var. slesvicensis Nitzschia amphibia — angustata —■ —■ var. acuta — dissipata — frustulum — sigma — sigmoidea — vermicularis Opephora Martyi Pinnularia borealis v. bre- vicostata — legumen — maior — mesolepta — viridis var. sudetica Pleurosigma sp. Rhoicosphenia curvata Rhopalodia gibba var. ventricosa — musculus Stauroneis anceps(?) — Smithii Stephanodiscus Hantzschii Surirella ovata — ovalis — robusta Synedra pulchella — tabulata — ulna — — var. aequalis var. biceps — vaucheria Tabellaria fenestrata — flocculosa Tetracyclus emarginatus Ca. 92% af Diatoméerne i den modtagne Prpve tilhprer den udprægede Ferskvands- slægt Fragilaria. Almindeligst er Arten pinnata, men ogsaa construens og varieteter heraf er meget almindelige. Af særligt bemærkelsesværdige Former kan nævnes Cyclotella antiqua, der er en ud- præget boreal Form. If. 0strup: Freshwater Diatoms from Iceland, 1918, er denne Art ret almindelig recent i Island. Ogsaa Tetracyclus emarginatus er karakteristisk for Nordeuropa og ret almindelig recent i Island (0strup). En Del Arter maa anses for at være indslæbte i den Ferskvandslokalitet, hvori Ler- arten er sedimenteret, fra nærliggende Kyster. Dette gælder saaledes Arterne Achnant- hes Hauckiana, Amphora coffeaeformis, Cocconeis scutellum var. parva, Diploneis

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