44 
Tr ne, Notes on tlie Pliysiology of tlie Sporopliyte etc. 
vature in response to the Stimulus of gravity is formed in tlie 
growing zone, therefore, in te sac-like portion of tlie calyptra, a 
feverage is gradually exerted by tlie bending zone against the 
slioulder marking the point of tlie sudden transition between tlie 
upper regions of tlie calyptra. This taken in connection with tbe 
action of tbe tigbtly clasping base lias tbe effect of slowly pul- 
ling tbat part of tlie sporopliyte in which tbe capsular enlarge- 
ment is seen to take place back into tbe roomy bag-like part 
of tbe calyptra wbere growth may go on until all danger from 
desiccation is past before tbe increasing bulk of tbe capsular ru- 
diment ruptures tlie calyptra and interferes with its efficiency as 
a protection against tbe loss of water. 
Tbe true relations of tlie curvature formation seem to sug- 
gest tliat tlie formation of tbis bond in tbe seta may serve a 
purpose cpiite different from tbat traditionally ascribed to tlie 
curvature. It may aid in advantageously arranging the relations 
of sporopliyte to calyptra as well as later wlien it assumes tbe 
nodding position, aiding in spore dissemination. 
Tbe conduct- of tbe calyptra in forms having erect capsules 
Avould be of interest in tbis connection. 
Bibliogr apbv. 
1) Wicbnra, M.T"Beiträge zur Physiologie der Laubmoose. (Jalirb. f. wiss. 
Bot. III. 1860. p. 193.) ^ r 
2) Gloebel, K., Organograpliie der Pflanzen. TI. 1. Jena 1898. p. 203. 
3) —: Organographie der Pflanzen. TI. II. 1898. p. 372. 
4) Sp aiding, Y. M., Tlie traumatropic curvature of roots. (Annals of 
Bot. Yol. YIII. 1894. p. 423.) 
5) Goebei, K., Organographie der Pflanzeu. TI. II. p. 372. 
see also 
Goebel, K., Plora. 1895. p. 474. 
