Explanations of Plau s. 
N. pulchella Allen. 
Plate i. Plant natural size. 
Plate 2. Fig. 1, primary verticil, X 5 ° 5 fig- 2 ? fertile leaflets, X 5 ° 5 fig- 3 ? 
sterile leaf; fig. 4, membrane of oospore, largely magnified. 
N. rigida Allen. 
Fig. I, natural-size ; fig. 2, fertile leaf, X 2 5 ; %• 3 ? oogonium, X 2 5 5 fig- 4 > 
oospore, X 5°; fig- 5> membrane of oospore largely magnified. 
N. Tanakiana Allen. 
Fig. 1, natural size ; fig. 2, sterile leaf, X 2 5 ; fig- 3 ? fertile leaf, female, X 2 5 ; 
fig. 4, male leaf, X 2 5 ; fig- 5, oospore, X 5° 5 fig- membrane of spore, largely 
magnified. 
N. Saitoiana Allen. 
Fig. I, natural size ; fig. 2, 3, 4, fertile nodes and terminals, X 2 5 > fig- 5 ? oospore 
X 5° ; fig- 6? membrane of spore, coarse, oval and elongated granules, irregularly ar¬ 
ranged. 
N. orientalis Allen. 
Plate i. Natural size. 
Plate 2. Fig. 1, stem-verticil, X 5 ° 5 fig- 2, first node ; fig. 3, fertile leaf; 
fig. 4, oospore, all, X 5° > membrane of spore with roundish granules largely magni¬ 
fied. 
N. multipartita Allen. 
Fig. 1, natural size; fig. 2, stem-verticil, X 5 ° 5 fig- 3 ? first node, X 5 ° 5 fig- 
4, tip of leaf, with mucro, X 200 5 fig- 5? oospore, X 5° ; fig? 6> membrane of 
spore with irregular granules, much magnified . 
N. MULTIPARTITA Allen, FORMA TRANSILIFORMA Allen. 
Fig. I, natural size ; fig. 2, primary rays, X 5 ° 5 fig- 3 ? first node, X 5° > fig- 4 ? 
fertile node, X 5° 5 fig- 5? terminals, X 5° 5 fig- 6? oospore ; fig. 7 ; membrane of 
spore. 
N. MULTIPARTITA Allen, FORMA SUBERECTA Allen. 
Fig I, natural size ; fig. 2, primary ray with nodes and terminals, X 2 5 ; % 3 . 
fertile, ultimate node, antheridium somewhat stipitate, X 2 5 > fig- 4? oospore, X 5° » 
fig. 5, membrane of spore. 
N. MULTIPARTITA Allen, FORMA INTERMEDIA Allen. 
Fig. 1, natural size ; fig. 2, primary ray and fertile nodes, X 5 °; fig- 3 ? termi¬ 
nals, X 5° *? fig- 4? oospore, X 5° > fig- 5? membrane of spore. 
N. gracillima Allen. 
Natural size; fig. 1, verticil and nodes, X 5 °; fig- 2, sterile verticil, X 5 ° ; 
fig. 3, oospore, X 5°; fig- 4,“membrane of spore. 
N. expansa fallen. 
Plate i. Natural size. 
Plate 2. Fig. 1, primary ray of leaf with the first node, fig. 2, second node ; 
figs- 3-6, ultimate nodes (very unequal terminals) ; fig. 7, oospore ; all figs, X 5 a 
