206 RKV. G. HEXSLOAV ON THE CAUSES OF 



Lycopodium CLAVATUM, i. 



Selaginella molliceps, Spring. 

 S. Lyallt, Spring. 



Amongst the few flowering plants of the collection are included 

 female spikes of HydrosfacTiys Goudotiana, of which the inflores- 

 cence was previously unknown. The flowers form dense spikes 

 1-1^ in. long, \ in. thick ; and the oblong coriaceous bract is ver- 

 rucose at the top and wrapped tightly round the capsule. There 

 is also a new Asparagm^ of which I give a description 



AsPAiiAGrsMADAGASCARiE]N'sis,-BflA(9r,n. sp. A much-brauched 

 climber, with slender, bright green, glabrous branches, the ulti- 

 mate ramuli subpatent, and growing gradually shorter towards 

 the top of the branch. Leaves obscurely calcarate. Phyllocladia 

 usually in threes, at the top of tlie branch, rarely solitary, flat, lan- 

 ceolate, bright green, glabrous, cuspidate, 3-4 lines long, erecto- 

 patent, with a very distinct midrib. Pedicels axillary, geminate, 

 articulated at the middle, finally | in. long. "Flower not seen. 

 Berry the size of a large pea. Of known species, approaching 

 only A. scandens, Thunb., of the Cape. 



Angr^cum Gilpin^. " Aphyllum (anthesi quidem), caules- 

 cens, radicibus tenuibus elongatis subcompressis (?) multiflexis, pe- 

 dunculo apice racemose, bracteis ovato-triangulis reflexis minutis, 

 ovariis longipedicellatis, sepalis tepalisque ellipticis obtuse acutis, 

 labelli lamina cochleari calceolari obtuse acuta, calcari sigmoideo 

 obtuso ovarium pedicellatum non sequante, rostelli falcibus elon- 

 gatis ascendentibus. 



A highly curious plant, with minute flowers, yellowish when 

 dry, scarcely exceeding \ inch. It is most curious for therostel- 

 lum, that points to the existence of a remarkable insect for its 

 fertilization. It is most respectfully dedicated to its discoverer." 



Beicli,fiL <Sf S. Moore, 



u 



Note on the Causes of the Numerical Increase of Parts of Plants. 



By the Eev. Geoege Henslow, M.A., F.L.S., F.G.S. 



[Read June 7, 1877]. 



T 



In the following note I have attempted to classify the various 

 methods and causes of the increase of parts of leaves and floral 

 whorls, more especially with the view of limiting each of the 

 various kinds to its proper cause respectively. 



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