19 
account of the seatdtinil of oxygen due to the process of Jars 
synthesis. On the other hand, the growth of Ulva in the neighbour- 
hood of towns sometimes become so excessive that the nuisance on 
decay is exceedingly serious. ‘The Ulva-enquiry is therefore of 
considerable economic importance, but in addition to this it is of 
very great interest from a purely scientific standpoint. The 
questions raised concern the chemist, the bacteriologist, and the 
botanist, and it is only by intimate co- eens that the subject 
can be successfully investigated. 
IV.—_DECADES KEWENSES 
Prantarum Novarum in Hersario Hortr Ree 
CONSERVATARUM. 
DECAS LV. 
ans uae hat rm egg Stapf [Ranunculaceae]; A. Soulie?, 
Fin agn., comparabile, sed caule terete, foliis brevissime 
petiolate panicula file majore ramis inferioribus longis ramulosis 
oblique erectis, pedicellis longis, galeae curvatura inferiore 
(marginibus) perconcava, nectarii ungue glabro, cuculla longiore, 
carpellis glabris, stylo longo distinctum 
Tubera ignota. — Caulis fere 1 m. altus, a medio ramosus, erectus, 
patule hirsutus. Folia numerosa, in parte intermedia congesta, 
basalia ignota; petioli subnulli vel superiores ad 5 mm, ongi ; 
laminae inferiores et intermediae utrinque glabrae, ne sg inferne 
ad margines et infra innervis, summi etiam supra magis minusve 
hirsutae, ambitu late orbiculari-ovatae, basi subtruncatae, ad 8 cm. 
longae et latae, ad 3 tripartitae, segmento intermedio rhomboideo- 
cuneato vel suiblancdGlate ad 6°5 ecm. longo ad 4 cm, lato, 
3-lobo lobis crenato-serratis crenis latiusculis apiculatis vel acutis, 
segmentis lateralibus oblique ovatis inaequaliter bilobis caeterum 
intermedio similibus ; folia summa minora et minus vel vix divisa. 
Inflorescentiae paniculatae, laxae, ubique Senke patule pilosae, cme 
inferioribus longis foliatis oblique erectis ramulosis; bractea 
superiores lanceolatae, utrinqgue dente 1-2 magno teinngelast 
instructae, inferiores in folia abeuntes; bracteolae lanceolato- 
lineares vel lineares ; pedicelli sub anthesi 3-4 cm. longi, demum 
magis elongati. Sepala coerulea ; summum galeatum pilosum, 2 em. 
altum, a basi ad apicem 1°5 cm, métiens, curvatura superiore fere 
semicirculari inferiore perconcava, acute ro ostratum rostro deflexo ; 
sepala lateralia late suboblique obovata, circiter 1°8 cm. longa, 
inferiora oblique anguste oblonga, circiter 1°5 cm. ) 
descendentia, Nectaria ungue ge acili superne prorsus parent glabro 
1-5 em. longo, cuculla ovata 7 mm. longa apice obtusissima et in 
dorso gibbosa, labio latiusculo ante! subintegro parce pilosulo, 
Ba 
