530 



EXPLANATION OF PLATES. 



PLATE 154. Trisetum molle (page 452). Fig. 1. a spikelet : Jig. 2. a rudimentary 

 flower : both magnified. 

 Festuca tenella (page 470), with a magnified spikelet. 



155. Poa dentata (page 461). Fig. 1. a spikelet : Jig. 2. a flower : Jig. 3. 



lower palea : Jig. 4. upper palea : Jig. 5. pistil. 



156. Tricuspis seslerioides (page 463). Fig. 1. a spikelet : Jig. 2. a flower : 



Jig. 3. lower glume : fig. 4. upper glume. 



157. Bromus secalinus (page 467). Fig. 1. lower palea : Jig. 2. upper palea : 



Jig. 3. stamens and pistils. 



158. Festuca nutans (page 471). Fig. 1. a spikelet : Jig. 2. a stamen : Jig. 3. 



lower palea : Jig. 4. upper palea. 



159. Antigramma (Asplenitjm) rhizophylla (page 494). Figs. 1-4. various 



occasional forms of the frond : Jig. 5. veins and sori, 



160. Onoclea sensibilis, var. obtusilobata (page 499). Fig. a. represents an 



entire specimen of a small form of the plant, natural size : Jig. b. a large 

 and more common form of the plant, represented in outline : Jig. 1. a 

 portion of the frond magnified : Jig. 2. a single segment, with the inflexed 

 margin laid open, and the indusia removed : Jigs. 3. & 4. outline figures, 

 showing the situation of the sori and the appearance of the veins. 



161 . Lygodium palmatum (page 504), with magnified figures of the fructification. 



