Upon examination, an unknown plant is found to have vascular tissue, spores, and large fronds. which of the following is the most logical conclusion about the classification of this plant? it is a horsetail, and belongs to the phylum sphenophyta. it is a fern, and belongs to the phylum pterophyta. it is a club moss, and belongs to the phylum lycophyta. it is a whisk fern, and belongs to the phylum psilophyta. upon examination, an unknown plant is found to have vascular tissue, spores, and large fronds. which of the following is the most logical conclusion about the classification of this plant? it is a horsetail, and belongs to the phylum sphenophyta. it is a fern, and belongs to the phylum pterophyta. it is a club moss, and belongs to the phylum lycophyta. it is a whisk fern, and belongs to the phylum psilophyta.