52 TRICHOMANES. 



bent back, separating again down the 

 middle. In early stages of its growth, the 

 folding over of the indusium can be clearly 

 perceived through a lens. Along the 

 centre pith of the stem internally are four 

 black hairs. May. Evergreen. Common. 

 Easy of cultivation. Rarer varieties are 

 found, more waving on the edges, indented, 

 forked at top, and so forth. Its bold and 

 simple form well suited to contrast with 

 the so different and compound aspect of the 

 majority of the other genera. 



TRICHOMANES. 



Sori in entire cups, springing from the pinnae, 

 dispersed. No Indusium. 



TRICHOMANES BREVISETUM. (Bristle Fern.} 

 Fig. 36. From 6 to 12 inches. Root thick, 

 fibrous, and creeping. Growing up at in- 

 tervals therefrom rather solitarily. Stem 

 with a thinner, filmy, border, like its 

 shadow, on each side. Frond oblong-tri- 

 angular. Pinna? alternate. Pinnules alter- 

 nate, and incised into a succession of 

 rounded forks or projections, smooth on 

 the edges, and of semi-transparent net- 

 work texture, resembling seaweed. Nerves 

 very prominent. Oftentimes not so com- 



