Starting from the botanical concept of plant type, the question is raised whether the concept of type can also be applied to plant communities. This is possible with the help of plant soc... read more
There are already a number of works on the biology of tree shapes, which primarily deal with conifers and European deciduous trees. In the present essay, an attempt is made to characterize the... read more
Homo-iconics (self-imaging) describes how the design type of the spermatophytes, which appears most concisely in the design type of annual dicotyledons, correlates in its imagery with the... read more
Traces of Chronos in the root region
Close investigation of rhythmic geniculation in root systems reveals cyclic processes of generation. Distinct roots repeatedly cease and are succeedec... read more
Evolutionary morphology a typological study of the development of form
The development of the inflorescence of Digitale lutea is described in detail from the formation of the primordium o... read more
On the behaviour of the leaf base of leaves in the vicinity to the blossoms of the genera Ranzmculus and Adonis
In the family Ranunculaceae we sometimes find transitional forms between th... read more
Clubmosses, grape-ferns and Adder’s-tongue ferns
The clubmosses (Lycopodiaceae), grape-ferns (Botrychium) and Adder’s-tongue ferns (Op/aioglossum) are rclatively rare groups of pterid... read more
The secret of candelabra algae (Characeae)
Candelabra algae (Characeae) belong to the most endangered fresh water plants. In deep lakes they need very clear water, poor in nutrients. In s... read more
The increase of morphological and physiological autonomy with the Volvocales
The transition to multicellularity in early evolution led to an emancipation from the environment and to an in... read more
Streptocarpus with a brood leaf
In the genus Streptocarpus (Gesneriaceae) the usual generation of new leaves on the shoot is more or less replaced by a generation of new leaf parts on the... read more