496 MOUNT WILSON AND ITS FERNS. 





Genus, Pteris. 

 Pteris aquilina. The common Bracken. 



Pteris tremula. Growing in great perfection at Happy Valley, 

 3 to 4 feet high. 



Pteris incisa. Found on the hill sides, but is not very plentiful. 

 Pellea falcata. Growing near the summits and on the hill sides. 



Genus, Allantodia. 



Allantodia tenera. This handsome fern grows in great 

 luxuriance at Mt. Wilson, the stipites being nearly 6 feet high, 

 and the fronds 6 feet 6 inches long. A truly graceful and elegant 

 fern. 



Genus, Hymenophyllum. 



Hymenophyllum tunbridgense. A beautiful and delicate mem- 

 branous fern. Very plentiful. 



Hymenophyllum flabellatum. Grows in great abundance, 

 frequently forming a dense matted covering on the trunks of 

 certain tree-ferns. There are other varieties of this diminutive 

 filmy fein in the deep gullies of Mt. Wilson. At the Cascade 

 Creek, one kind, having with its matted roots, grown down the 

 stream over a precipitous rock, hangs from it like a handsome 

 festoon. 



