MUSCI. 



173 



tonemal growths with short cells are formed on the tips of the leaves ; the like 

 occurs in Grimmia trichophylla, Syrrhopodon, and Calymperes. In Oncophorus glaucus 

 a thick felt of tangled protonema-filaments appears on the fertile summits of the 

 plants, prevents their further growth, and eventually produces instead new patches 

 of young plants. In Btixbaumia, especially B. aphylla, the marginal cells of the 

 leaves form a protonema that grows round them and round the stem. Lastly, leaves, 

 as those of Funaria hygrometrica, when cut from the stem and kept moist will put 

 out a protonema. 



The cells even of parts of the sporogonium can grow out into a protonema, 



FIG. 127. Longitudinal section of the summit of a very small male plant of Funaria hygrometrica ; a a 

 young, b an almost mature antheridium in longitudinal section, c paraphyses, d leaves divided through the mid- 

 rib, <? through the lamina. Magn. 300 times. 



as Pringsheim and Stahl have shown *. If the seta of detached capsules is placed on 

 moist sand, protonema-filaments will grow from its inner cells and new plants will 

 be formed on the filaments, and the wall of the capsule has equally the power of 

 putting out protonema-filaments from its cells. In Conomitrium julianum a young 

 plant often grows from the inner surface of the calyptra (vid. inf.) with the intervention 

 of a short piece of protonema. 



1 Pringsheim, Ueber vegetative Sprossung von Moosfriichten (Monatsbericht d. Akad. d. Wiss. 

 in Berlin, 1876). Stahl, Ueber kiinstl. hervorgerufene Protonemabildung an d. Sporog. d. Laub- 

 moose (Bot. Zeit. 1876, p. 689). 



