Beitrag
Diatoms from Andorra
Carter, John R.
Nova Hedwigia, Beihefte Beih. 31 (1970), p. 605 - 632
33 Literaturangaben
veröffentlicht: Apr 1, 1970
DOI: 10.1127/nova.beihefte/31/1970/605
ArtNo. ESP051003100023, Preis: 29.00 €
Abstract
Detailed knowledge of the diatom flora peculiar to the Pyrenees is scanty. With the exception of Hustedt’s paper of 1938 only Baudrimont (1966) and Margalef (1954) have touched upon the area. Whilst it is not supposed that the present paper can in any way supply a complete flora of this great range of mountains it is felt that for the small area investigated it perhaps fulfills a useful purpose. The material was collected by Mr. J. Broadhead during the summer of 1966 and 1967 and comprises five samples which contain more than two hundred species 212 of which are enumerated in the systematic part of this paper. The remaining few, mostly in the genus Pinnularia, are difficult to place and it has been thought advisable to devote more study to them and report upon them later. Sample No. 1 came from a small pond just over the Andorran border from France. Sample No. 2 from a ditch near Llorts which is in the only side valley in the republic. Sample No. 3 from a roadside boggy stream. Sample No. 4 from a clear stream near Soldeu and sample No. 5 from the Rio d’Envalira. The association of forms in sample No. 1 comprises a large number of species of Pinnularia and Cymbella and of the ninety species to be found here no less than twenty two are in these two genera. Perhaps the most interesting items are a few cells of Tabellaria binalis (Ehr.) Grun. and a considerable number of Thalassiosira fluviatilis Hust, both of which are forms not to be expected in an alpine habitat. The occurrence of Neidium alpinum Hust, is worthy of note as it becomes more probable that it is very well distributed but has been overlooked. If Neidium perminutum Cl.-Eul. is the same form, as Reimer has assumed, then the diatom is probably present throughout northern Europe (it certainly occurs in the Scottish Highlands) as well as in North America.
Schlagworte
Andorra • Pyrenees • diatom