fotogalerie

Special succulents and cacti – the pavilion A, upper floor

The whole phylogenetical development of plants from the primitive thallophytic algae to the angiosperms, which are the most morphologically and anatomically complicated plant organisms, is driven by the need to conquer the living space on the Earth. From the very beginning the same problem has existed: unfavourable living conditions for plants on the landmass. It was absolutely necessary for plant life to cope with the drying of water from the important organs. The emergence of the plant vascular system originated from this need. The most sensitive reproductive stadium, so called gametophyte in ferns, gradually ceased to be advantageous as a separate small plant organ and was therefore closed into the seed and there protected (see the Zamiaceae, Cycadales). Finally also the seeds themselves were encapsulated in the ovary (Angiosperms).

Echeveria laui Echeveria laui The exhibition. The exhibition. Echinocereus pentalophus Echinocereus pentalophus

Here in this exhibition one can follow the indicators of the last phase of this victorious expedition of plants into the landmasses including deserts. The top performer of this ability to cope with the drought and to penetrate into the huge and still growing desert areas is the thick-leaved or crassulaceous angiosperms. It is these plants which are meant when one says “succulents”. A large selection of this group is presented here with the special emphasis on interesting and beautiful species.

Namely the cacti (Cactaceae) are a large succulent family and for a better understanding we can estimate their number as being approximately three thousand species (Backeberg 1963).

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© J. M. POST