BY L. RODWAY. 255 



1913. 



Var : siihsqnarroscum, Wamst. Elongated, slender, de- 

 pauperated. 



Sphagnum Weymouthii Wamst. 



Not robust, seldom exceeding 10 cm., the divergent 

 branches tapering, about 3 cm. Stem cortex medium 

 breadth of three series of cells. Stem leaves ovate, obtuse 

 2.2 mm., border well defined of 4 cells, tracheids copiously 

 fibred, pores few placed at angles. Branch cortex of large 

 inflated short cells apparently without pores. Branch 

 leaves broadly ovate, geniculate, concave, with an obtuse 

 cuspidate apex 3 mm., border narrow, 2-3 cells; ti'acheids 

 broad ; pores few, very small, mostly at the angles ; cells 

 elliptic, not very small, central. 



Mt. Macmichael, Blue Tier. 



Sub-section Cuspidata. Slender, the pendant branches ^ot 

 always very distinct from the divergents; leaves narrow 

 ovate to liuear, apex truncate cuspidate at least in the 

 lower leaves ; stem cortex of 1-2, rarely 3 series of narrow 

 cells, the woody cylinder indistinct; tracheids narrow, 

 mostly 10-25m broad. Ohlorophyllous cells usually wedge- 

 shaped, broadly exposed on the external surface. 



Leaf margin plain cuspidatutn. 



Leaf margin cuspidate. 



Branches straight or flaccid. 



Tracheids with few or no fibres triclwphyllum. 



Tracheids copiously fibred Brotherusii. 



Branches falcate. 



Lower leaves linear drepanocladum. 



Lower leaves ovate-lanceolate Rodwayi. 



Leaves with few or no tracheids, all cells chlorophyllous 

 serriilatum. 



Sphagnum cuspidatum Ehrh. 

 Slender, fascicles distant, branches usually 4-5, the pen- 

 dants with very narrow leaves but not appressed to the 

 stem. Stem cortex 1-2 series of cells, wood cylinder not 

 distinct. Stem leaves ovate-oblong 1.5 mm., very obtuse, 

 apex truncate, cuspidate, border broad, lower tracheids 

 without fibre, cells as broad as tracheids. Branch leaves 

 oblong-lanceolate, the middle ones 3 mm., basal ones 

 shorter and broader, terminal ones longer, attenuated ; 

 margin with a border of 5-7 linear cells, incurved, entire 

 or with very small distant serrulations, apex truncate, cus- 

 pidate; tracheids short in lower to very long in upper 

 leaves, 17-25m diameter ; pores small circular, few to many 

 along both margins 6i"; in transverse section cells half as 



