EXPLANATION OF PLATES. 



PLATE 1. 



Fig. 1. Polypodium subspathulatum. Plant, of the natural 

 size; 1 a, section of a frond, with a single sorus; 1 b, echinate 

 sporangium. The details more or less magnified. 



Fig. 2. Polypodium conforme. Plant, of the natural size ; 2 a, 

 section of a frond, with a single sorus ; 2 h, echinate sporangium. 

 The details magnified. 



Fig. 3, 3. Polypodium minimum. Plants, of the natural size; 

 3 a, section of the fertile part of a frond ; 3 b, sporangium. 

 The details more or less magnified. 



Fig. 4, 4. Polypodium Haalilioanum. Plants, of the natural 

 size ; 4 o, section of a frond, with a single sorus ; 4 b, glandular 

 hairs mixed with the sporangia ; 4 c, sporangium. The details 

 more or less magnified. 



P L A T E 2. 



Fig. 1. Polypodium contiguum. Plant, of the natural size; 

 1 a, section of a frond, showing sori ; 1 b, hairs from among the 

 sporangia; 1 c, hairs from the under side of the rhachis; 1 d, 

 sporangium and spores. The details more or less magnified. 



Fig. 2. Polypodium decorum. Plant, of the natural size ; 2 a, 

 portion of a frond ; 2 b, hairs from under side of the rhachis ; 2 c, 

 hairs from among the sporangia ; 2 d, sporangium. The details 

 all more or less magnified. 



Fig. 3, 3. Polypodium sarmentosum. Plants, of the natural 

 size ; 3 a, section of a segment, with a sorus ; 3 b, hairs from 

 among sporangia; 3 c, hairs from under surface of frond; 3 d, 

 sporangium. The details more or less magnified. 



PLATE 3. 



Fig. 1. Polypodium procerum. Section of frond, of the natu- 

 ral size ; a, under side of a portion of a fertile pinnule ; b, hairs 

 from the veins on the under surface ; c, c, sporangia. The details 

 magnified. 



PLATE 4. 



Fig. 1. Gymkogramma pilosum. Portion of a frond, natural 



size ; 1 a, section of a pinna, showing the sori ; 1 b, hairs from 

 the rhachis beneath ; 1 c, c, sporangia. The analyses magnified. 



Fig. 2. Stegnogramma Sandwicense. Portion of the middle 

 of a frond ; 2 a, a, sections of a pinna, showing the sori ; 2 b, b, 

 sporangia. The details more or less magnified. 



PLATE 5. 



Fig. 1. Goniopteris longissima. Portion of a frond, of the 

 natural size ; a, section of a segment, showing the sori ; b, scale 

 from the rhachis ; c, sporangium. The details more or less mag- 

 nified. 



PLATE 6. 



Fig. 1. Drynaria ALATA. Entire frond, natural size; a, a, a, 

 sections of a pinna, showing the venation and sori ; b, b, sporangia. 

 The details more or less magnified. 



PLATE 7. 



Fig. 1. Drynaria maxima. Summit of a frond, of the natural 

 size; a, entire frond, one-fourth of the natural size; 6, b, section 

 of a frond, showing the sori and venation ; c, c, vertical section of 

 the same, showing the partially sunken sori ; d, d, sporangia. 

 The details more or less magnified. 



PLATE 8. 



Fig. 1, 1. Hemionitis ELONGATA. Plants, of the natural size; </, 

 cross section of the stipe; b, hairs from the base of the stipe ; c, 

 section of a pinna; d, articulated hairs mixed with the sporangia; 

 e, e, sporangia. The details magnified. 



PLAT E 0. 



Fig. 1. Elaphoglossum Samcense. Plant, of the natural size. 

 1 a, sporangia; 1 b, sporules. The details magnified. 



