284 SOUTH AFEICAX FEEX XOTES. 



()RJ)ER IV, OPHIOGLOSSACEAE. 



Ophioglossum capense, Sw. ( = 0. vulgaium , Linn.). 

 ,, reticnlatum, Linn. 



ORDER V, LYCOPO])L\CEAE. 



Ly CO podium verticillatum, Linn. 



,, dacrydioides, Baker; Zambesiland, etc. 



(Syn. Fil.). 

 ,, cernuum, Linn. 



,, clavaturn, Linn. (=-clavatu)n , Linn., var. 



infl,exum, Spr.). 



ORDER VI, SELAGINELLACEAE. 



Solagmclla rupestris, Spr. 

 ,, depressa, A. Br. 



,, kraussiana, A. Br. 



,, imbricata, Spr. 



,, moJIiccps, Spr. 



ORDER VII, PSILOTACEAE. 



PsiJotuDi iriqncirinn, Sw. 



ORDER VIII, EQUISETACEAE. 



Equiscfitui ranwHtssihium , Desv. 



THE LEAVES OE HAKEA FECriXATA AND 

 H. SUAVEOLENS. 



B}' Horace A. Wageu, A.E.C.Sc, 



Professor of Botaui/, Transvaal U nivertiity College, Pretoria. 



With Two Te.vt Fujures. 



Read July 15, 1920. 



Hakca pectinata has a much-divided compound leaf, the 

 segments being cylindrical and sharply pointed. The leaf shows 

 strong xerophytic characters. A cylindrical segment has the same 

 structure all round. As seen in transverse section, there is a 

 central vascular tissue, consisting of one large and several smaller 

 bundles lying in soft ground tissue, with small patches of 

 sclerenchyma generally connected with the bundles. This central 

 tissue is separated from the assimilative tissue — mostly palisade 

 cells — by a definite ring of cells. Then there is a well-defined 

 epidermis with thick cuticle and sunken stomata. The mo'st 

 striking feature in the structure of the leaf, however, is the' 

 presenee of peculiar thickened, elongated, single cells, termed 

 idioblasts. These are very numerous, and run radially through 



