12 Rev. W. A. Leighton on the Gland of 



of minute filaments indistinctly septate, over which is spread a 

 network of longitudinal fibres. No fructification has hitherto 

 been detected. There can be little doubt of the lichenoid nature 

 of this plant, the structure being similar to that of Coenogonium. 

 (See Karsten's Paper in Ann. Nat. Hist. ser. 3. vol. viii. p. 203, 

 pi. 11.) 



Plate IV. fig. 16. Filament, magn. 330 times linear, 

 fig. 17. Filament, magn. 1200 times linear. 



Chroolepus Arnottii, Hook., of which I have an authentic spe- 

 cimen gathered " Kinross- shire, July 7, 1837," approaches these 

 plants in external aspect ; but the microscope shows it to consist 

 of branched filaments of spherical cells, of a rich chocolate- 

 brown, tapering towards the extremities, where a distinct con- 

 jugation may be seen. 



Plate IV. fig. 18. Filament, magn. 330 times linear. 



fig. 19. Conjugation at extremity of filament, magn. 330 times 



linear. 

 fig. 20. Conjugation, magnified 660 times linear. 



Lichina pygmcea, Ag. (Leight. Lich. Brit. Exs. 260) is beauti- 

 fully represented in Grev. Scott, Crypt, t. 219, and its micro- 

 scopic details in Tulasne's Mem. Lich. tab. 9. figs. 1-6. 



Mount's Bay, Cornwall (/. Ralfs, Esq. !) may be recorded as 

 an additional habitat. 

 Plate IV. fig. 21. Sporidium, magn. 1200 times linear. 



Lichina confinis, Ag. This Lichen is also beautifully given 

 in Grev. Scott, Crypt, t. 221, and in Tulasne, /. c. tab. 10. 

 figs. 12-18. 



Mount's Bay, Cornwall (/. Ralfs, Esq. !), and Black Stones, 

 Conway Bay, Caernarvonshire ! June 1856, are additional 

 habitats. 

 Plate IV. fig. 22. Sporidium, magn. 1200 times linear. 



Pterygium centrifugum, Nyl. Syn. 92; Arnold, Lich. Juras. 

 Exs. 159, may probably be found on our limestone-rocks. 



The scales on the Plate are the ^ o^o o-th of an inch, magn. 330, 660, and 

 1200 times linear. 



III. — On the Gland of the Phyllodium o/ Acacia magnifica. 

 By the Bev. W. A. Leighton, B.A., F.B.S.E. 



My attention has been attracted to a plant of Acacia magnifica 

 when in blossom. On the upper edge of the vertical phyllodia 

 (for the plant has no true leaves) subtending the showy spikes of 

 yellow flowers, which proceed from their axils, appeared a pellucid 

 drop of liquid, varying in size from that of a large pin's head 



