124 THE BOTANICAL MAGAZINE. EV°^ «^V- No. 4U. 



however, to be seen in comparatively rare cases, such as Microkpfa 

 pilosella, M. Wilfordi and M. marginata. 



2. In most creeping as well as erect rhizomes of Polypodiaceae, 

 leaves are arranged all round the rhizome, though the external appear- 

 ance may not reveal this condition in the creeping rhizome. 



3. The arrangement of foliar gaps of the stele in the rhizome 

 is generally constant in every species, though in some cases there 

 are slight variations. 



4. The number and the position of departure of foliar traces 

 are generally constant in each species. The former varies according 

 to species from one to seven or more, at the point of departure from 

 the gap. 



5. The stele in some species shows solenostelic construction; 

 e. g. Microlepia pilosella, M. Wilfordi, M. marginata. 



6. Some species have the stele of transitional type between the sole- 

 nostelic and the dictyostelic; e. g. Adiantum pedatum, A. monochlatnys. 



7. Rhizomes of most species of Polypodiaceae have dictyostelic 

 stele. They may be classified as follows. 



A. Rhizomes with Ys phyllotaxy. 



I. Those with transverse commissures or with two and three 

 meristeles in a cross section of the stele. 



a. A leaf with a single foliar trace. 



a. Clockwise phyllotaxy Athyrium nipponicum. 



/?. Counterclockwise phyllotaxy Athyrium yokoscence. 



b. A leaf with two foliar traces. 



a. Clockwise phyllotaxy Diplazium Wichurae. 



/9. Counterclockwise phyllotaxy Dryopteris dccursivo- 



pinaata, Coniogramme fraxinea. 



c. A leaf with three foliar traces. 



a. Clockwise phyllotaxy Plysticbum lepidocaulon, P. acu- 



leatum var. japonicum. 



II. Those wite oblique commissures or with three and four 



meristeles in a cross section of the stele. 



a. A leaf with two foliar traces. 



a. Clockwise phyllotaxy Dryopteris africana, D. sopho- 



roides, D. japonica, D. gracilescens var. abbreviatum, 



Diplazium lanceum. 

 ^. Counterclockwise phyllotaxy Diplazium japonicum, D. 



Conilii, Dryopteris setigera, Asplenium incisttm, Onoclea 



sensibilis. 



