Cymbopleura rainierensis (Sovereign) Bahls, 2013

Bahls, Loren, 2013, New diatoms (Bacillariophyta) from western North America, Phytotaxa 82 (1), pp. 7-28 : 13

Cymbopleura rainierensis (Sovereign) Bahls , comb. nov. ( Figs 27–33 )

Basionym: — Cymbella rainierensis Sovereign (1963 , New and rare diatoms from Oregon and Washington, Proceedings of the California Academy of Sciences, 4 th Series, 31: 363, fig. 20).

Holotype: — USA, Washington: Mount Rainier National Park, Mowich Lake , CAS accession no. 600718, CAS holotype slide no. 206007, CAS isotype slide no. 187092 ( Kociolek et al. 1999).

Vouchers: — USA, Washington: King County, Surprise Lake , 47.6689 o N, 121.1392 o W, elev. 1374 m, coll. L. White, 25 August 2012. MDC sample 496301; MDC slides 41-60 ( Fig. 27 ), 126-54. MONTU !— USA, Washington: Yakima County, Mount Rainier National Park, Frog Pond above Dewey Lake , 46.8558 o N, 121.4883 o W, elev. 1573 m, coll. R . Davis , 18 August 2012. MDC sample 496001; MDC slides 41-54 ( Figs 28, 29, 32 ), 126-48. MONTU !— USA, Montana: Glacier County, Glacier National Park, Paradise Pond , 48.4792 o N, 113.3692 o W, elev. 1600 m, coll. L. Bahls, 7 September 2006. MDC sample 375701; MDC slides 117-10 ( Figs 30, 31 ), 38-10. MONTU !— USA, Montana: Glacier County, Glacier National Park, No Name Hanging Fen , 48.4786 o N, 113.4492 o W, elev. 1829 m, coll. L. Bahls, 28 June 2009. MDC sample 451401; MDC slides 123-53 ( Fig. 33 ), 39-82. MONTU !

Observations:—This taxon has neither an apical pore field nor stigmata and therefore belongs more appropriately in Cymbopleura .

Distribution and Ecology: — Cymbopleura rainierensis is widespread and locally abundant in lakes, ponds and fens of the Pacific Northwest, where it prefers circumneutral waters with low levels of electrolytes.

Family Gomphonemataceae Kützing 1844: 82

Genus Gomphonema C.G. Ehrenberg 1832: 87

Figures

FIGURES 21–33: Cymbopleura edlundii, Cymbopleura rainierensis. Figs 21–26: Cymbopleura edlundii from Starvation Ridge Pond, Glacier National Park, Montana (type locality). Fig. 24: Holotype specimen. Figs 27–33: Cymbopleura rainierensis. Fig. 27: Surprise Lake, King County, Washington. Figs 28, 29, 32: Frog Pond above Dewey Lake, Mount Rainier National Park, Washington. Figs 30, 31: Paradise Pond, Glacier National Park, Montana. Fig. 33: No Name Hanging Fen, Glacier National Park, MT. Scale bars: 10 µm.