630 EXPLANATION OF PLATES. 



PLATE 154. Trisetum moli.e (page 452). Fig. 1. a spikelet : fig. 2. a rudimentary 

 flower : both magnified. 

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



155. PoA DENTATA (page 461). Fig. 1. a spikelet : fig. 2. a flower : fig. 3. 



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



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



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



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



fig. 3. stamens and pistils. 



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



lower palea : fig. 4. upper palea. 



159. Antigramma (Asplenium) rhizophvlla (page 494). Figs. 1-4. various 



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



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



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

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

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

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

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



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



