50 FORMS OF CELLULAR TISSUE. [BOOK r. 



oblong, with a sort of leg or projecting lobe towards one 

 end ; and sometimes irregularly triangular, with the 

 sides pressed in and the angles truncated. They are 

 well represented in the plates of Adolphe Brongniart's 

 memoir upon the organisation of leaves, in the Annales 

 des Sciences, vol. xxi. 



3. The cubical ; in the epidermis of some leaves, in the bark of 

 many herbaceous plants, and frequently in pith. (Plate I. 

 fig. 13.) 



4. The prismatical ; in some pith, in liber, and in the vicinity 



of vessels of any sort. (Plate I. fig. 6.) 



5. The cylindrical (Plate I. fig. 8. a) ; in Chara; this has 

 been seen by Amici so large, that a single vesicle mea- 

 sured four inches in length and one third of a line in 

 diameter. (Ann. des Sciences, vol. ii. p, 246.) 



6. The fusiform, or the oblong pointed at each end; in the 



membrane that surrounds the seed of a Gourd. (Plate I. 

 fig. 5.) 



7. The muriform; in the medullary rays, This consists of 

 prismatical bladders compressed between woody tissue 

 or vessels, with their principal diameter- horizontal, and 

 in the direction of the radii of the stem. It is so 

 arranged that when viewed laterally it resembles the 

 bricks in a wall; whence its name. (Plate I. fig. 7.) 



8. The compressed ; in the epidermis of all plants. Here the 

 bladders are often so compressed as to appear to be only 

 a single membrane. (Plate I. fig. 2. a ; Plate III. fig. 

 3, 4, &c.) 



9. The sinuous ; in the epidermis, and also sometimes beneath 

 it, as in the leaf of Lilium candidum. (Plate III. fig. 5.) 



10. The stellated ; where the cells are so deeply lobed at the 

 angles as to leave open passages between them, as in the 

 stem of Eriophorum vaginatum. Plate III. fig. 2. is an 

 approach to this structure. 



11. The tabular ; as in the epiphloeum of many plants. 

 Cellular tissue is frequently called Parenchym. Professor 



Link distinguishes Parenchym from Prosenchym; referring 

 to the former all tissue in which the bladders (Plate I. fig. 1, 

 3, 6, 7 &c.) have truncated extremities ; and -to the latter, 



