1 



pA- "T ir^' ■ -T^T« ■^ ■ . ■!*■ -T" 



WOLLASTOX EXPEDITIOX TO DFTCII NEW GUINEA. 485 



4000 ft., Borneo, coll. G-. D. Hayilaml"; (4) Kinabalu, L. S. Gibbs, 

 No. 3118. 



(1) Is fruiting, the seta ratlicr long, 2-3 cm., not very stout. 



(2) Throe sheets, of the male plant. 



(3) FruiUng ; seta shorty 2 cm., decidedly stouter than in Burbidge'^ 

 plant, 



(4) The male plant. 



These I have compared carefully with J), gramlls, Schliepli. & Greh., and 

 ]^, svperha^ Grrev. Gehoeb gives certain diiterentiating characters between 



the lamelire of these two species^ not all of -which I have been able io 

 confirm. They may be summarized thus: 



D. ijnwdls. Lamellfc 30 /i. high, 3-4-seriatc* In section, apical 



cell scarcely differentiated, only a little higher. 



I), superha. Lamclhc CO/x higli, 5-8-seriate* In secliouj apical cell 

 considerably larger, wider. 



And, in addition, tlie characters drawn from the face view, referred to- 

 below. 



In the numerous leaves of 7>. (jrandis and /). svperha 1 have examined, I 

 do not find the character drawn from the apical cell at all so well defined as 

 Avould appear from this. In D. superha from Australia I do not find the 

 apical cell at all constantly wider than the lower ones in section. On the 

 other hand, the characters drawn from the face view of the lamelhc I find 

 quite good, vi/. in D, (jrandis the cells of the lower series are often 

 transversely elongate^ sometimes rectangular, but more often with the 



^ 



'ertical (and sometimes the horizontal) walls oblique, so that the cells are 

 irregularly rhomboid. 



In D.siiperha they are smaller, and are nearly subqiiadrate, often regularly 

 so, though frequently somewhat irregular. The lamellx are also constantly 

 higher in D. superha, though the difference is perhaps not quite so well 

 marked as the above figures would imply. 



In J). {/ramlisj\y]ien the lamella^ are viewed on the face surface, the apical 

 cells are decidedly less strongly differentiated from the lower than in 

 D. superha ; this is partly due to their being nearer in size, and still more to 

 their being less pellucid, the lumen being more or less obscure with cell- 

 contents. 



These characters, while somewhat slight^ together with the fruitin*^ 



characters, constitute no doubt sufficient grounds for separating the New^ 

 Guin(\a ]J. grandis from the Australasian D. SKperha, 



The Borneo JJ. allissima, Geh., is very near indeed to D. grandis in the 

 structure of the lamella}. These arc usually 4-stratose, though occasionally 

 higher. The lower cells in face view are usually fairly regularly subquad- 

 rate, as in D. svperha. The apical cell, however, is much larger, quite 



LIKN. JOURN. — BOTANYj A^OL. XLV. 



2m 



