Náttúrufræðingurinn - 1974, Qupperneq 85

NÁTTÚRUFRÆÐINGURINN
79
S U M M A R Y
The Genus Trentepohlia Mart. (Chlorophyceae) in lceland
by
Helgi Hallgrimsson
Museum of Natural History, Akureyri.
The occurence of Trentepohlia aurea (L.) Mart. in Iceland is known since
late in the last century. The botanist Helgi Jónsson reports it as comnion in
the dimly lighted caves and grottos in the lava fields o£ Snælellsnes (SW). Since
1950 the author has loutul it in several localities in North and East Iceland,
where the main habitats are small caves, especially in river ravines.
In 1960 Trentepohlia abietina (Flot.) Hansg. was found in the lava field o(
Adaldalur (NE), growing in great quantities on Juniperus communis. The
specimens are very dark, almost black in mass, and dark greygreen with a
tinge of yellow or red under the microscope. Anastomosis between individual
cells in neighbour threads are frequently observed. Otherwise they appear
rather typical.
The third species, Trentepohlia umbrina (Kiitz.) Born. was discovered on
lietula lorluosa in the valley of Vatnsfjördur (NW), in the summer 1971, and
is also reported with some doubt from a stone in Vestmannaeyjar (Boye-Peter-
sen, 1928).