I I T ru f. Notes oii tho Physiolngy of tlie Sporophyte etc. 



vaturc in resjxmse tu tlu- siiinulus oT ^a";tvity is loniicd in the 

 ^^rowiiig zt)nt'. tlierefore, in te sac-liko j)<)rtifin of the calyptra, a 

 levorage is gradually cxcrtcd hy the l:)ending zone against the 

 Shoulder markin«; tlie j)()int of the sudden transition betweon the 

 u})|)er rogions of tlic calyptra. This taken in connoction with the 

 action of the tightiy chisjjing hase has tho effect of slowly pnl- 

 ling that j^art of the sporophyte in which the capsular enlarge- 

 ment is seen to takr phice back into the roomy bag-like part 

 of the oalyptra where growth may go on until all danger from 

 dosiecation is past beforo the incroasing bulk of the capsular ru- 

 diment ruptures the calyptra and interferes with its efficien<'y as 

 a protection against the loss of water. 



The true relations of the curvature formation seem to sug- 

 gest that the formation of this bond in the seta may serve a 

 purpose quite different from that traditionally ascribed to the 

 curvature. It may aid in advantageously arranging the relations 

 of sporophyte to calyptra as well as later when it assumes the 

 uodding position, aicling in spore dissemination. 



The conduct of the calyptra in forms liaving erect capsules 

 would be of interest in this connection. 



Bibliography. 



1) AVicliura. M., Beiträge zur Physiologie der Laubmoose. (Jahrb. f. wiss. 



Bot. III. 1860. p. 193.) 



2) Goebel, X.. Organograpliie der Pflanzen. Tl. 1. .Jena 1S98. p. 203. 



3) — : Organographie der Pflanzen. Tl. IL 1898. p. 372. 



4) Spalding, V. M., The traumatropic curvature of roots. (Annais of 



Bot. Vol. VIII. 1894. p. 423. j 



5) Goebel. K., Organographie der Pflanzen. Tl. IL p. 372. 



see also 

 (Toebel, K., Flora. 1895. p. 474'. 



