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By George A. Petrides

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4. Semi-ring-porous xylem. The ring boundary is indicated by a few large earlywood vessels. Stem of an 80 cm-tall shrub, ruderal, arid subtropical, Chio, Tenerife, Macaronesia, Spain. Sonchus capillaris, transverse section.  2. Annual plant with very small vessels arranged in radial multiples. All cells are lignified. Polar root of a 40 cm-tall therophyte, ruderal, hill, Teglio, Valtellina, Italy. Crepis capillaris, transverse section.  5. Diffuse-porous xylem. The ring boundary is indicated by a marginal parenchymatic band.

Our results are in accordance with previous authors. Holdheide (1951) described the bark of Hedera helix in detail. Secretory ducts in the phloem indicate a taxonomic relationship to the Apiaceae family. 1 sclereids in tangential rows R8 with crystal druses 4 4 R12 with laticifers, oil ducts or mucilage ducts R16 phellem consists of regularly arranged rectangular cells, Rosaceae type 4 38 Asteraceae Number of species, worldwide and in Europe Asteraceae The cosmopolitan Asteraceae family includes 1600 genera with 23,000 species.

Apotracheal and paratracheal parenchyma with a tissue of fairly thickwalled fibers. Stem of a 2 m-tall shrub, hill zone, temperate climate, Botanical Garden Batumi, Georgia. Ilex colchica, transverse section. 32 Ecological trends and relations to life forms Distinct ring boundary zones are characteristic for species of temperate climates and growth zones for Ilex canariensis, which grows in the laurel forest in subtropical climate. Aquifoliaceae Discussion in relation to previous studies The xylem of the genus Ilex was subject of an intensive study by Baas (1973).

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