The Botany of Iceland - 01.12.1945, Page 37

The Botany of Iceland - 01.12.1945, Page 37
THE VEGETATION OF CENTRAL ICELAND 379 2. THE AQUATIC VEGETATION The vegetation which grows in open water in which hardly any or no moss covers the bottom I have called the aquatic vegetation. According to the size and nature of the waters we may distinguish be- tween the vegetation in small lakelets, in large lakes, and in running water. In the highland regions investigated by me there are several lakes of considerable size. All those investigated by me are devoid of phanerogamous vegetation, though they are surrounded by land covered with vegetation. However, as several of them harbour some animal life, they must contain some plankton. I suppose that the absence of the phanerogams is due to the generally very sandy bottom, and every year fresh supplies of blown sand are carried by the wind into the lakes. This loose sandy bottom must be very unfavourable to the vege- tation. All the rivers with fairly abundant flows, the glacier rivers and others, are likewise devoid of phanerogamous vegetation. Thus the aquatic vegetation of the highland is associated exclusively with the small pools and rivulets. The following species were observed: Batra- chium paucistamineum, Potamogeton filiformis, both species found in several places though none of them can be said to be common, Callitriche autumnalis, Hippuris vulgaris, each of them in only a single place near Landmannahellir. In running water I have only found Batrachium paucistamineum in a rivulet in Hvannalindir. In the hot rivulet in Lau- gar on Landmannaafrjettur I found Callitriche stagnpiis and Potamoge- ton pusillus. Thus it may be established that above an altitude of 500 m the aquatic vegetation is very poor. The only species that are fairly common are Batrachium and Potamogeton filiformis; however, these two species are as a rule of scattered occurrence and do not form actual growths, and they are rarely found in the same locality. The highest locality for these two species is a small lake near Hvannalindir at 670 m above sea-level. The occurrence of the other species is quite sporadic. 3. PLANT COMMUNITIES ON MOIST SOIL (MÝRI SERIES) To this series I refer all the plant communities which grow in such moist soil that the water reaches the surface of the soil or the soil is flooded by it at any rate for part of the year. Often there is no sharp limit between the mýri series vegetation and the aquatic vegetation, 26-»
Page 1
Page 2
Page 3
Page 4
Page 5
Page 6
Page 7
Page 8
Page 9
Page 10
Page 11
Page 12
Page 13
Page 14
Page 15
Page 16
Page 17
Page 18
Page 19
Page 20
Page 21
Page 22
Page 23
Page 24
Page 25
Page 26
Page 27
Page 28
Page 29
Page 30
Page 31
Page 32
Page 33
Page 34
Page 35
Page 36
Page 37
Page 38
Page 39
Page 40
Page 41
Page 42
Page 43
Page 44
Page 45
Page 46
Page 47
Page 48
Page 49
Page 50
Page 51
Page 52
Page 53
Page 54
Page 55
Page 56
Page 57
Page 58
Page 59
Page 60
Page 61
Page 62
Page 63
Page 64
Page 65
Page 66
Page 67
Page 68
Page 69
Page 70
Page 71
Page 72
Page 73
Page 74
Page 75
Page 76
Page 77
Page 78
Page 79
Page 80
Page 81
Page 82
Page 83
Page 84
Page 85
Page 86
Page 87
Page 88
Page 89
Page 90
Page 91
Page 92
Page 93
Page 94
Page 95
Page 96
Page 97
Page 98
Page 99
Page 100
Page 101
Page 102
Page 103
Page 104
Page 105
Page 106
Page 107
Page 108
Page 109
Page 110
Page 111
Page 112
Page 113
Page 114
Page 115
Page 116
Page 117
Page 118
Page 119
Page 120
Page 121
Page 122
Page 123
Page 124
Page 125
Page 126
Page 127
Page 128
Page 129
Page 130
Page 131
Page 132
Page 133
Page 134
Page 135
Page 136
Page 137
Page 138
Page 139
Page 140
Page 141
Page 142
Page 143
Page 144
Page 145
Page 146
Page 147
Page 148
Page 149
Page 150
Page 151
Page 152
Page 153
Page 154
Page 155
Page 156
Page 157
Page 158
Page 159
Page 160
Page 161
Page 162
Page 163
Page 164
Page 165
Page 166
Page 167
Page 168
Page 169
Page 170
Page 171
Page 172
Page 173
Page 174
Page 175
Page 176
Page 177
Page 178
Page 179
Page 180
Page 181
Page 182
Page 183
Page 184
Page 185
Page 186
Page 187
Page 188
Page 189
Page 190
Page 191
Page 192
Page 193
Page 194
Page 195
Page 196
Page 197
Page 198
Page 199
Page 200
Page 201
Page 202
Page 203
Page 204
Page 205
Page 206
Page 207
Page 208

x

The Botany of Iceland

Direct Links

If you want to link to this newspaper/magazine, please use these links:

Link to this newspaper/magazine: The Botany of Iceland
https://timarit.is/publication/1834

Link to this issue:

Link to this page:

Link to this article:

Please do not link directly to images or PDFs on Timarit.is as such URLs may change without warning. Please use the URLs provided above for linking to the website.