NAMES AND TEEMS. 
175 
Lunaria — Z., lunar, lunate (referring to the crescent-like 
shape of the pinnae). 
Ceterach officinarum — 
Ceterach , corruption of Chetherak , Arabic or Persic (mean- 
ing not known) . 
officinarum of officina — Z., officinal (used in medicine). 
Cystopteris fragilis — 
kystos — G., a bladder ; pteris — G., a fern. 
fragilis — Z., fragile, brittle. 
Hymenophyllum unilaterale — 
hymen — G., a membrane or film ; phyllon — G., a leaf. 
unilaterale — Z. , one-sided. 
Lastrea ^emula — 
Lastrea , the Latinized name of M. de Lastre. 
cemula — Z., emulating, rivalling. 
— cristata — Z. , crested. 
— dilatata — Z., dilated, spread out, broad. 
— Filix-mas — Z. , filix , fern ; mas, male or mascu- 
line. 
— montana — Z., mountain -growing. 
— remota — Z., remote. 
— rigida — Z., rigid. 
— spinulosa — Z., spinulous, prickly-toothed. 
— Thelypteris — G . , thelys , feminine ; pteris , a fern. 
Ophioglossum vulgatum — 
ophios — G., a serpent or adder; glossa — G., a tongue. 
vulgatum — Z. , common. 
OSMUNDA REGALIS — 
Osmunda, derivation and meaning unknown. 
regalis — Z., royal. 
Polypodium calcareum — 
polys — G. y many ; pous — G. } a foot : many -footed. 
calcareum — Z. , chalky, limestone-growing. 
— Dryopteris — G., drys, an oak ; pteris , a fern. 
— Phegopteris — G., phegos, a beech ; pteris , a fern. 
— vulgar e — Z., vulgar, common. 
