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NAMES AND TERMS. 
Lunaria — L., lunar, lunate (referring to the cresent-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 ^mula — 
Lastrea , the Latinized name of M. de Lastre. 
arnula —Z ., emulating, rivalling. 
— cristata — Z., crested. 
— dilaiata —Z., dilated, spread out, broad. 
— Filix-mas —Z., flix, 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., 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. 
— vulgare —Z., vulgar, common. 
