Слика од Pteris ensiformis Burm.

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Pteris

spore arrangement

Kubitzki et al
trilete
URI: http://eol.org/schema/terms/trilete

Дефиниција: spores bearing a Y shaped scar, indicating that they were arranged in a tetrahedral spore tetrad

Припис: https://www.ucl.ac.uk/GeolSci/micropal/spore.html

сите записи
Kubitzki et al
trilete
URI: http://eol.org/schema/terms/trilete

Дефиниција: spores bearing a Y shaped scar, indicating that they were arranged in a tetrahedral spore tetrad

Припис: https://www.ucl.ac.uk/GeolSci/micropal/spore.html

сите записи