. The Canadian field-naturalist. Natural history. 1970 Swales and Bider: Moor Matgrass in Quebec 51 Nardiis clumps in both Site I and II were dis- sected by the runways of Microtiis pennsyXvam- cus, the meadow vole, whose activities might well have contributed to the spread of the grass in the immediate vicinity. Site III Several clumps of Nardus, from one foot to three feet in diameter, were in an open meadow, in line with, but 20 feet below the above sites. The grassy sward was dominated by Dant/ionia spicata, and the soil had a pH of Site IV This site was toward the base of a west- slo
. The Canadian field-naturalist. Natural history. 1970 Swales and Bider: Moor Matgrass in Quebec 51 Nardiis clumps in both Site I and II were dis- sected by the runways of Microtiis pennsyXvam- cus, the meadow vole, whose activities might well have contributed to the spread of the grass in the immediate vicinity. Site III Several clumps of Nardus, from one foot to three feet in diameter, were in an open meadow, in line with, but 20 feet below the above sites. The grassy sward was dominated by Dant/ionia spicata, and the soil had a pH of Site IV This site was toward the base of a west- sloping hill below a seven-year-old planting of Jack pines, but in the channel of air drift from Sites I and II on the plateau. There were a few widely separated small clumps of Nardus, par- tially shaded by pines in the morning, and asso- ciated with Danthonia spicata, Agrostis alba, Festuca rubra. Festuca ovina, Achillea mille- folium, and Rubus groutianus. The introduction of Nardus to this site was probably through wind-blown caryopses or birds. It was fruiting freely all on sites in 1968. Chromosomes Apart from the less extensive root system of Nardus stricta in the Laurentians, our popula- tion appeared identical with those described in the British Isles, and continental Europe as well as with the specimen in the Macdonald College Herbarium from Greenland, at 60°37' N., 44°42' W. Root-tip squashes of a plant from the Lac Carre population provided several good cells for the study of metaphase figures and all showed 26 somatic chromosomes (Figure 3). The literature shows some variations in counts in various areas of the world. Although the so- matic count is n = 26 in the British Isles and continental Europe, Love and Love listed counts of 2« = 26, 27, 28, 29 and 30 in differ- ent Icelandic collections (Love and Love 1956), while Bowden found 2« = 30 in two collections made by I. J. Bassett in 1949 in Newfoundland (Bowden 1960). Such differences could be the result of low
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