72 



BOTANY. 



S. Cymose monopodiwm, in which the axis soon ceases to grow, and 

 is overtopped by one or more of its lateral branches. 



a. Forked cymose monopodium, in which the lateral branches 

 are all developed (Fig. 45, C). 



b. Sympodial cymose monopodium, in which some of the lateral 

 branches are suppressed ; this may be — 



6'. Helicoid, when the suppression is all on one side (Fig. 



45, D); or— 

 6". Scorpioid, when the suppression is alternately on one 

 side and the other (Fig. 45, A and B). 

 Practical Studies. — (a) Mount and examine under a low power of 

 the microscope or by the naked eye alone the following in order as 



a Q 



FlQ. 45.— Diagrams of cymose monopodial branching. A and B scor- 

 pioid cymes ; C, forked cymose monopodium, the compound or falsely 

 diohotomous cyme (called also the dichasium); D, helicoid cyme. 



examples of thallomes: 1, Groen Slime; 2, Pond Scum; 3, the first 

 stage of a fern "seedling" (little flat green growths, 3-5 mm. across, 

 which often appear on the earth near ferns in greenhouses) ; 4, Sea- 

 lettuce (Ulva); 5, Irish moss (Chondrus), the latter showing a much- 

 lobed form. 



(6) Study as examples of caulome forms the following in order 

 1, the stem of Lamb's Quarters, or Indian corn; 2, runners of the 

 strawberry; 3, root-stocks of blue grass; 4, tubers of the potato; 5, 

 conns of Gladiolus, or Indian turnip; 6, bulb-axis of the onion; 7^ 



