Plate XIX. 



Fig. 1—3. Alaria ochote)uli^ sp. nov. 



Fig. ] . Par!: of n cross section of the luidrilj : tlie ]>ireneliym-:itic tissue on 

 the left side is the inDerinost part oî the iuner cortex ; the 

 thick-walled, large cells, with the hyplial strands traversing 

 through the iutercelhilar spaces ou the right, belong to the 

 pörimedullarj tissue ; interposed l)etween these two parts, a nar- 

 row area of the niedullarv sheath, comp )sed of the fibrous cells. 

 X 240. 



Fig. 2. Surface view of the blade at an upper part to show the disti-ibution 

 of the mucilage glands in a square millimeter, x 54. 



Fig. B. A mucilag(3 gl md seen from the surface of frond, through the epider- 

 mis. The arrangement of the epidermal cells overlying the 

 gland is more or less dishu'bed l)ut not under any fixed rule as 

 in Undari/i pinudflßrla : no sp:.M'ial prre for the gland is to l)e 

 seen, x 240. 



Fig. 4. AJarui marf/inaüi FosT. et lluriî. 



Cross section of the midrib showing a. marginal swelling of the 

 medulla and right half of the thickness of the midrii). In this 

 spacies the j)eri medullary tissue and the medullary sheath are 

 slightlj^ differtnitiated ; the spanning cortex is also p )orly 

 developed in comparison, with tlie other spacies. x 240. 



Figs. 5-12. IToiiKvodrouia lalifoliiim J. Aci. 



Fig. 5. Iihizoidal part of a young plant with embryonal shoots stai'ting from 



it. About X 50. Somewhat diagi'ammatic. 

 Fig. (]. Embryonal shoot of a single row of cells, x 240. 

 Fig. 7. The same ; a more advanced stage. The cells in the upper pirt of 



frond are broader than height. The apical hair bc^gius to 



appear, x 240. 



Fig. 8. The same ; still more advanced stage. The celh in tlie middle and 

 upper part of frond are divided longitudinally and transversely 

 to form the raonosti'omatic blade. The apical hair is eLjngated 

 and septated. x 240. 



Fig. 9. A young monostromatic frond, with apical hair rompleted. Tlie 

 mai'ginal hairs are issued pairwise from the upper corners of 

 "segments." Each "segment" is one cell-areole initiated from 

 a mother cell, x 240. 



Fig. 10. A part of margin of a l>la;le of ;ibout 3 mm. in length ; young- 

 hairs starting from the intervads of the older ones as the l)lade 

 increases in length b}^ cell-nmltiplication. x 240. 



Fig. 11. Cross section of a frond Avhicli began to be distromatic. x 240. 



Fig. 12. Surface view of the blade to show the starting of a hair-tuft ; the 

 epidermal celU are divided into nnich s nailer ones which 

 initiate the hairs. The hair-initiating cells are riclu3r in 

 chromoplasts than the ordinary epidermal cells, x 450. 



