32 



MANUAL OF BOTANY 



thus produces two shoots, which, at any rate at first, are of 

 equal strength, so that the foot or podium bears two branches 

 arranged in a forked manner (fig. 42), the branching is 

 termed dichoiomous. This form is common in many of the 

 Cryptogams. 



In dichotomous branching we have again two forms : one 

 which is termed true or normal dichotomy, in which tlie two 

 Fig. i4. 



A. B 



C D 



Fig. 44. Diagram to illustrate cj'mose branching. A. Dicbasial cyme or 

 Bichasium. The successive axes are marked by the letters, a, a', «% tv'. 

 The continuation of each axis above the point of origin of the axes spring- 

 ing from it is the thin line terminated by a small cii-cle. B. Dichasium 

 with the successive axes suppressed on one side forming a helicoid sym- 

 podium. C. Scorpioid sympodium formed by the suppression of the suc- 

 cessive axes on alternate sides. D. The same after it has become straight- 

 ened by growth. The apparent monopodinm is seen to be composed of 

 parts of tile successive axes. 



brandies continue to develop equally in a forked manner — that 

 is, each becomes the podium of a new dichotomy (fig. 42) — and 

 a second, in which at each division one branch grows much more 

 vigorously than the other and divides into two, while the other 

 remains undivided ; this is called syinpodial (fig. 43, A and B). 

 In this latter case, owing to the unequal growth of the branches, 

 the strong branches of successive bifurcations form together an 

 axis which is termed the pseud-axis or sympodium. on which 

 the weaker fork-branches or bifurcations appear as lateral 

 branches (fig. 43, A, r, r, r, r, and B, r, I, r, I, r). This branching 

 might at first sight be confounded with the monopodial type 



