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Height. From six inches to two feet. 
Colour. Dark, shining green. 
Habitats. Damp situations. Hedgerows, old walls, 
ruins, and the mouths of old wells. Abun¬ 
dantly distributed, but less common in the 
northern counties. 
GROUP I; GENUS XV. 
TRICHOMANES. 
Sori. Marginal, the thecae growing around columnar 
prolongations of the veins, and enclosed in 
cup-like involucres formed by the distention 
and separation of the margin of the mem¬ 
branous frond. These prolongations extend 
beyond the edge of the involucres in the form 
of spikes or bristles. 
Veins. 
Free, and very distinct. 
M 
