9©^ Dr. R. Caspary on F-urcellaria fastigiata 



this inner part b of stratum A is often almost entirely wanting 

 in the stem. Fig. 5 represents four of these cells. 



2ndly. A stratum of globose, oval or elliptical cells, the walls 

 of which are transparent, uncoloured, with a greenish, rarely a 

 brownish cast ; the intercellular spaces between them are filled 

 up with the same, probably slimy matter, as in the epidermal 

 cells. The contents of this second stratum of cells, which in 

 fig. 1 & 2 is represented in B and more highly magnified in fig. 6, 

 arefree, colourless, large, globose granules which iodine colours 

 brown, if seen in mass, although, if we look at the single grains, 

 these exhibit a cast of dirty violet. The relative proportion of 

 the breadth of these cells to their length = 1 : l|-2. Their ab- 

 solute size is nearly equal to the cells of the inner part of the 

 epidermal stratum. Neither this nor the second sort of cells is 

 " dichotomous.'* 



3rdly. The third sort of cells is intermixed with the fourth 

 sort in the middle of the stem ; see fig. 1 & 2, C and D. This 

 third sort of cells, having a relative proportion of breadth : length 

 = 1 : 3-8, consists of more or less cylindrical, horizontal or slant- 

 ing cells, which run in all directions in the intercellular spaces 

 between the perpendicular long cells of the middle of the stem. 

 The cells of this third sort form strings, leaning with one end to the 

 cells of the second sort, and changing probably slowly by degrees 

 into the cells of the fourth sort, which latter I nevertheless oould 

 not succeed in ascertaining by direct observation. As these cells 

 of the third sort therefore seem to be nothing else but a form 

 mediating the transition between the second and fourth sort, 

 their claim to be considered a peculiar sort may be doubted ; but 

 as their form nevertheless, even if their transition into the fourth 

 sort should be established by direct observation, is very promi- 

 nent, I describe them as a peculiar sort. Fig. 7 represents these 

 cells. Their walls are like the walls of the second stratum, and 

 their contents likewise colourless, globose grains, although these 

 are often wanting. Iodine has the same effect upon the grains 

 as upon those of the second stratum. Generally only two cells 

 meet with their ends as in fig. 7, but occasionally three or four. 

 Their absolute length is very different. I found in four the fol- 

 lowing length : 0-0277'"; 0-0285'"; 0-0391'"; 0-0557'". 



4thly. The fourth sort of cells of the stem of Furcellaria fas- 

 tigiata is to be found in its middle, consisting of long, cylindrical 

 cells, placed parallel to the axis and meeting each other at the 

 ends, so that they form strings. The relative proportion of the 

 breadth : the length of these cells = 1 : 15-20. They are represented 

 in figs. 1 & 2, occupying the last part on the right-hand side, marked 

 G and J). Fig. 12. PI. V. represents such a cell, and shows how it 

 is at its ends connected with others. I believe I have seen, although 



