780 DOMATIA IK CEHTAIN AUSTRALIAN AND OTHER PLANTS, 



into (4) a veiy loose spongy parenchyma also rich in chlorophyll, 

 the cells large in size, and staining deeply; (5) a thick-walled 

 epidermis sometimes having brown contents as in Tar r let i a, out 

 of which grow the hairs, two, three or more hairs springing from 

 one cell (fig. 13); (6) the cuticle with stomata. 



Sloanea Woollsii, F.v.M. — The depressions are in the axils 

 of the midrib and laterals, and begin at the lowest pair. They 

 number 15-21, and are minute — 1 mm. in diameter. The leaf is 

 hard in texture and smooth ; it wets readily above, but on the 

 under side the water runs into patches. There is not such a 

 decided thinning of the leaf as in Viburnum, but the thickened rim 

 runs all I'ound, and few hairs grew on this. Stomata are found 

 on the under surface, but, so far as I can see, none extend to the 

 hollow. The microscopic structure is as in the last-named species, 

 except that there are no deeply staining cells, and the spongy 

 parenchyma becomes very dense over the roof. 



Gai:denia sp. — In a commonly cultivated species of this plant 

 I found depressions filled in with long straight hairs springing 

 from the vein and midrib : they are roughened on the surface, 

 septate, and have green or brown contents at the tip. Stomata 

 occur in the pit. 



Grou'p iv. 



Examples are seen in Hydrangea hortensis, Sieb., Morinda 

 ciirifolia, Linn., and MandeviUea sp.hort. There is nothing 

 resembling the microscopic structure of the cavities, etc., to be 

 seen in these. The cells from which the hairs spring in Mande- 

 viUea are bright crimson. I have also seen them in Prunus 

 Lusitanica, Linn., P. domestica, Linn., Rxibiis Moorei, F.v.M., 

 Solanum sp.hort., and some other plants, but I have not made 

 sections of these. 



Group V. 



The only plants which I have seen, hairy all over but having a 

 thicker tuft in the axils, are Psycholria loniceroides, Sieb., and 

 JJiploglottis Cunninghamii, Hook. f. 



