[automatically translated] Taxonomical revision about the deciduous oaks of Sicily.- On the basis of literature, herbarium and field investigations, a survey on the species of deciduous oaks occurring in Sicily is presented. A morphological description fitted with drawings and completed by some chorological and ecological observations is reported for each species. Finally it is emphasized That the phenotypical variability Observed Sicily Q. humilis Within the group, even if let to consider the area as a probable S.Thyrrhenian speciation center of the group, on the other hand Should Also be related to the deforestation, Which favored the genetic mixing among the populations. The present study brought` to the recognization Sicily of 9 species, well distinguished by morphological, ecological and phenological features. They are: Q. cerris, well known species, Sicily widespread in mountain sites of the north-eastern part of the island; Q. gussonei, endemic closely related to the previous species, occurring in the sub-mountain belt of N-Sicily, where it is localized on siliceous Substrata; Q. fontanesii, probably an hybrid between Q. gussonei and Q. suber and distributed Pertaining Within the area the former parent; Q. petraea, Sicily Exclusively Represented by the new subsp. austrotyrrhenica, very rare endemic Sicilian-Calabrian localized in fresh and foggy valleys Within the beech belt; Q. congested, Q. Virgil, dalechampii Q., Q. amplifolia, and Q. leptobalanos, all Belonging to the group Q. humilis. In particular: Q. congested is an acidophilous and orophilous species endemic of Sicily, Calabria and Sardinia, Mainly caratterizzata having small and regular bark-ribs, an extremely short fruiting axis bearing several fruits having a small cup cyathiform covering not more than 1/4 of the acorn, and vey small and finely imbricate scales; Q. Virgil is Mainly distributed in the basal and sub-mountain belt, and has to bark quite similar to the previous species but as a main feature it presents very big acorns covered up to 1/2 by an hemisphaeric-barrel-shaped cup having a very irregular border and uniformely silky scales; Q. dalechampii is an orophilous species caratterizzata by very prominent ribs-thick bark, acorns covered up to 2/3 by an ogival hemispaeric-cup with a regular border and long silky scales at the basis, carinate and dark at the tip; Q. amplifolia is the most thermophilous among the sicilian deciduous oaks and has to bark very similar to the previous species but the very big acorns covered up to 1/4 by an cyathio-barrel-shaped cup having humped subglabrous or sparsely hairy scales make this species unmistakable ; Q. leptobalanos is a very localized sicilian endemic growing incoherent Exclusively on siliceous soils in the mountain-belt of NW-Sicily, it is Mainly caratterizzata by a greysh bark with small and regular ribs and by the production of a great number of small fruits bearing Generally on long axis. Finally it must be stressed Q. That Sicilian, quoted from Sicily by several authors, must be Considered in phantom species, since it is described on a specimen taken from plant cultivated in the Botanical Garden of Palermo, probably to be ascribed to Q. canariensis ; while Q. Likely minaae is an hybrid form having an uncertain taxonomical value. Some other species, even if reported for the Sicilian flora, must be excluded from it, since Their mention is mostly two to a mistake in the identification specimens, as in the case of Q. crenata, Q. humilis, Q. robur, Q . frainetto, Q. brachyphylla.
|Number of pages||41|
|Publication status||Published - 1999|
All Science Journal Classification (ASJC) codes
- Ecology, Evolution, Behavior and Systematics
- Plant Science