La vegetazione degli Stagni di Ossero (Cherso)

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Abstract
The Author has studied the vegetation of the Ossero pools (the large and the small one) analising especially the formation which are characteristic of them. In the level partion of the large pool the following formations — starting from the beach — are to be noted: Salicornia herbacea L., Hordeum marinum Huds., Inula viscosa All. and Artemisia coerulescens L. The Salicornia herbacea L. formation is sensibly homogencus in that portion of its area in which, owing to the high saline concentration of the soil, no other pecies is able to grow. In the remaining portion with a lower saline concentration, other species accompagny Salicornia herbacea. The Hordeun marinum Huds. formation comprises that portion of the pool which, being but little above the sea level, is invaded by high tides during the winter time. The saline concentation of the soil is here lower than in the area of the Salicornia herbacea formation. On the sea side Hordeum marinum is mixed to Salicornia herbacea; on the opposite side it accompanies annual species with brief life cycle. The Inula viscosa All. formation which is generally characteristic of the newly formed ground in the Ossero pound is only occasional and consequently unstable. Last of all the Artemisia coerulescens formation is much more stable than that of Inula viscosa, although established in a ground of similar origin, but with a greater humus content. Of special interest are two small lakes which are situated on the border of the large pool. Thir vegetation is composed by typically laky species. The author compares the succession of formation described above with that of the other coast marsh in the mediterranean region, especially at Campora, Arbe (see Morton 1915). Here is, however, the succession of formations not so regular as in the large pool of Ossero. Nevertheless, both Campora and Ossero are to be classified as « Formation des Meeresstrandes» (Morton). Crypsis aculeata Ait., Hordeum marinum Huds., and Medicago litoralis Rohde found at Ossero were not known for the flora of Cherso. The vegetation of the small pool at Ossero (which only rarely invaded by the sea water) does not show the regular succession of formations which is typical of the large pool it comprises two main groups of species, namely: 1) those living between the beach and the pool, and 2) those extending from the pool to the inland. Some species present in the large pool (among them Crypsis aculeata, Hordeum marinum, Medicago litoralis) are not represented in the flora of the small pool and vice versa.

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