Woodhead, N. & Tweed, R.D. (1953). The freshwater algae of Anglelsey and Caernarvenshire. North Western Naturalist, series 2,, 25: 85-112, 255-296, 392-435, 564-602.
262004
Woodhead, N. & Tweed, R.D.
1953
The freshwater algae of Anglelsey and Caernarvenshire.