62 TRANSACTIONS AND PKOCEEDINGS OF THE [Sess. lv. 



single row, as in E. Tetralix and the two now being examined. 

 The vascular bundle of the midiib shows a pretty large 

 sclerenchynia growth on its upper side, but none or very 

 little below. Hooker states that the cilia of the sepals are 

 not gland-tipped, but all specimens of E. Machayi that I 

 have obtained shew these. I believe he referred here to Dr 

 Stuart's type, which exhibits this peculiarity. The corolla is 

 always regular and ovate-urceolate, as in E. Tetralix. The 

 stamens in E. Mackayi and E. Tetralix have anther-tails, and 

 in all that I have examined they are of equal length, or 

 nearly so. The ovaiy of E. Machayi is usually stated to be 

 glabrous, but microscopically one finds hairs like those of 

 E. Tetralix, but fewer and very much shorter. Tlie style and 

 stigma in both resemble each other, I regard it, therefore, 

 with Hooker, as a well-marked variety or sub-species of E. 

 Tetralix, differing in most of the characters he gives, but 

 further, in the leaf being flat, the circum-stomatic epidei'mal 

 processes longer, the sclerenchynia of the vascular bundles de- 

 cidedly stronger below than above, the sepals ovate-acuminate 

 with glandular-ciliate margins, and in the ovary being only 

 slightly hairy. 



I now pass to the form first found by Dr Stuart. Mr 

 Lindsay informs me that it occurred quite near the area of 

 rather dry, rocky ground, on which E. Mackayi grows, but 

 in the rather boggy part adjoining the more natural habitat of 

 E. Tetralix. Now it is curious to note that Babington's atten- 

 tion was arrested by the probable efiects of environment, for 

 he says E. Tetralix gradually dwindled in proportion to dry- 

 ness of soil, and that E. Machayiana did the same ; when 

 leaving the rock it encroached u])on the bog by which it was 

 surrounded, and on which its ally was remarkably flourishing, 

 neither <jf them changing at all in character, but only in size 

 and luxuriance. The specimens obtained covered an area of 

 several square feet, and show greater diflerence in appearance 

 and structure from E. Tetralix or E. Mackayi tlian do either 

 of these from the otliei'. 



When examined with a lens the leaves are quite glabrous, 

 and entirely devoid of the glandular cilia so well developed 

 in the two just described. On microscopic examination, 

 liowever, one to three small glandular cilia on the petiole 

 iriay be seen, and at regular intervals along the leaf-margin 



