318 



PLANT STUDIES 



contain both kinds, for Mosses are both dioecious and mono3- 

 cious. The two principal groups are as follows : 



207. Sphagnum forms, — These are large and pallid bog 

 mosses, found alnindantly in marshy ground, especially of 

 temperate and arctic regions, and are conspicuous peat- 



Pui. 201. t>j>Ji(trininii ; ^1, a leafy l)taiifli (gametopliore) bearing four maliiri.' .-^ixiro 

 goiiia ; />', iirclifgoniam in whose VL-nter a young embryo sporopbyte [tiin is dc- 

 ^'clojiing ; <'. section of a young sporogonium (sporophytel. sliow iiig tlie liulbnus 

 foot (.'•■/'/■i iniberUU'd in the apex of the pseudopodium (iis). tbe (■;i|i.suk- lAi, the 

 roluniella uro rapped by the dome-shaped arcliespDriiim i.sy^^i, u p(U'tion of the 

 f!ily]itra icrM, and the old archegonium neek [<iJi)\ f>, bmneb bearing mature 

 tiporogouium and showing p.^eurlopodinni {/>.s]. capsule (/,i. and niiercnlum (rf1 ; 

 B, antheridium discluirging s|iiTnis ; F, a single spenn, showing coiled body and 

 two cilia,— Aftei' Sciinii-Ki;. 



formers (Fig. 201). The leaves and gametophore axis are 

 of peculiar structure to enable them to suck up and hold a 

 large amount of water. This alnindant water-storage tissue 

 and the com})aratively poor display of chlorophj'll-contain- 

 ing cells gives the peculiar pallid appearance. 



208. True Mosses. — TliivS immense and most higlily organ- 

 ized Bryophyte group contains the great majority of the 



