. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. 20 A Canadian Arctic Expedition, 1913-1918 Penium spirostriolatum Barker (Plate III, fig. 6) A few individuals of this beautiful desmid occurred in the Hippuris swamp at Herschel island. It also has not been previously recorded from arctic America. Closteriutn Nitzsch. Closterium Cornu Ehrenb. (Plate IV, fig. 16) This was a very common species from the tundra pond and the pond between the lake and sea at Teller. It was found also on Pihumalerksiak island (Cockburn point). The majority of specimens were more curved then
. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. 20 A Canadian Arctic Expedition, 1913-1918 Penium spirostriolatum Barker (Plate III, fig. 6) A few individuals of this beautiful desmid occurred in the Hippuris swamp at Herschel island. It also has not been previously recorded from arctic America. Closteriutn Nitzsch. Closterium Cornu Ehrenb. (Plate IV, fig. 16) This was a very common species from the tundra pond and the pond between the lake and sea at Teller. It was found also on Pihumalerksiak island (Cockburn point). The majority of specimens were more curved then the type form. Not previously recorded from American arctic regions. Closterium Dianae Ehrenb. - This little Closterium was found with some plankton gatherings, August, 1915, from the big lake at Bernard harbour. Closteriutn didymoctocum Corda var. striatum nov. var. (Text fig. 2) Semicellulae membrana atrofulva, striata, striis 13-15 transversis bene distinctis. Cells large as in type, 9-12 times longer than their diameter. Outer margin slightly curved, inner margin almost straight. Sides gradually attenuated towards the apices which are broad and truncate with rounded, somewhat slightly recurved angles; cell wall reddish brown, definitely striate, 13-15 striae visible across the cell; annular thickening of darker colour at each apex. Length, 340^. It was not common but all individuals seen were the same. It was obtained on Herschel Fig. 2. Closterium didymoctocum Corda var. striatum nov. var. X 475; semi-cell showing the striated wall and the regular characters of the apex. Closterium Jenneri Ralfs The type form was found in the Hippuris swamp at Herschel island. A form with apices less curved than type was found in a collection of bottom deposits and plankton from Teller. Closterium moniliferum (Bory) Ehrenb. This was only found in the lagoon lake at Teller. It is commqn in Canada and the United States, but had not been previously recorded from the arctic regions o
Size: 2962px × 844px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1919
