312 REPRODUCTION 



place in moist sand in a small dish and cover with a bell-glass. 

 Follow the germination of the nematogenous cells, and note the 

 development of the protonema, and the production of a new 

 gametophyte. 



399. Propagation by Modified Leaves in Aulacomnion. Collect 

 specimens of Aulacomnion palustre, or A. androgynum, which 

 may usually be found on charred logs, stumps, or wet boggy 

 soil, and note that the leaves on the upper, terminal part of 

 the stems are of different form from those below, and are 

 easily detached. Examine with low power and make out gen- 

 eral structure. Place a number of the thickened leaves in a 

 moist chamber and examine three days later. Note the number 

 and location of the nematogenous cells and their germination. 

 Follow the course of growth of the protonemae and the appear- 

 ance of the gametophyte. 1 



400. Gemmae of Scapania. Collect specimens of Scapania ne- 

 morosa from its habitat on moist banks or rocks and find the uni- 

 cellular gemmae on the tips of the upper lobes of its leaves and 

 the apex of the stems. Remove and cultivate in moist chamber. 

 Note the development of the new gametophyte, and compare with 

 that of the germination of the gemmae of the mosses. 



401. Gemmae of Kantia. Collect specimens of Kantia tricho- 

 manis from moist banks, ditches or decaying logs and note the 

 clustered gemmae found on the tips of the orthotropous shoots. 

 Place in moist chamber and follow development. Compare with 

 that of Scapania. 



402. Gemmae of Marchantia and Luniilaria. Examine the 

 upper surfaces of thalli of Marchantia, or Lunularia until recepta- 

 cles are found containing numbers of small green globose bodies 

 constituting gemmae. Cut a cross section of the thallus through 

 the receptacle to obtain a view of the short stalks on which the 



1 Correns, C. Untersuchungen ueber die Vermehrung der Laubmoose. 191, 206. 

 1899. 



Goebel, K. Organographie der Pflanzen. Part 2, Hft. i. 273. 1898. 



Heald, F. A study of regeneration as exhibited by mosses. Bot. Gazette. 26 : 

 169. 1888. 



