Assertion: fern's shape | /r/CapableOf | cover the sporangia
Facets:
Source sentences:
text: Features important in the identification of ferns include such aspects of the mature sporophyte plant as differences in the stem, frond, sporophyll, sporangium, and position of the sporangium and the absence or presence, as well as the shape, of the indusium (a membranous outgrowth of the leaf) covering the sporangia.