1) Bristle ferns 2) Fern genus 3) Genus trichomanes 
• (n.) Any fern of the genus Trichomanes. The fronds are very delicate and often translucent, and the sporangia are borne on threadlike receptacles rising from the middle of cup-shaped marginal involucres. Several species are common in conservatories; two are native in the United States.
(from the article `fern`) ...tiny ferns with blades only 1 or 2 cells in thickness between veins; spores globose, green; gametophyte ribbon-shaped or filamentous, gemmiferous; ...
<botany> Any fern of the genus Trichomanes. The fronds are very delicate and often translucent, and the sporangia are borne on threadlike receptacles rising from the middle of cup-shaped marginal involucres. Several species are common in conservatories; two are native in the United States. ... Origin: L, a kind of plant, from Gr. ... Source: ...
[n] - bristle ferns
genus Trichomanes noun bristle ferns; kidney ferns