Excerpt from The Flora of the Palouse Region: Containing Descriptions of All the Psermatophytes
Plant containing woody tissue and vessels in the stem and producing spores asexually, which, on germination, develop very small flat mostly green structures called prothallia, on which are borne the sexual reproductive organs from which the asexual plant is developed. The sexual plant is rarely collected, and the classification is based mainly on the characters of the asexual plant.
Class I. Filicineae.
Plant highly organized, vascular, with green, usually large leaves: spores borne within the tissue of, or in modified hairs on, modified or unmodified foliage leaves: stem solid, underground (in ours).
Order I. Ophioglosseae
Plant consisting of an underground stem bearing one or more leaves which rise above ground and are divided usually into two parts, a fertile portion and a sterile portion, the latter being the foliage part of the leaf; frequently the fertile portion lacking in some of the leaves: sporangia borne within the tissue of the fertile portion, ring-less, opening by a transverse slit.
Family I. Ophioglosseae.
Characters of the Order.
I. Botrychium.
Rootstock very short, with clustered fleshy roots: sterile part of the leaf ternately or pinnately divided or compound; veins free: fertile segment 1-3-pinnate, each pinnule bearing a double row of sessile sporangia; spores numerous, sulphur-yellow.
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