Assertion: fern's type | /r/HasProperty | the protostele
Facets:
value: biologically
type: MANNER
Source sentences:
text: The simplest and apparently most primitive type of stele is the protostele, in which the xylem is in the centre of the stem, surrounded by a narrow band of phloem.
text: In addition, a fern produces three types of leaves which are biologically called trophophyll, sporophyll and brophophyll.