6 Dr. Grisebach on the Germination Phragmites, Hippuris vulgaris, Menyanthes trifoliata, Alisma Plantago, Equisetum limosum and palustre, Scirpus lacustris, Chara hispida, Nymphcea alba, and several others. The following are all the characteristic marks of this species that I can recollect. O. cerugescens, Filaments extremely slender, opake green, con-glomerated in large toughish glutinous masses in sheltered calm situations, and nearly floating on the surface; in more open exposures broken into innumerable fragments, and sus-pended like cloudy flocculi in the water. Striae numerous, at distances of about half a diameter apart from each other. Os-cillatory motion often lively. Colour when dried a beautiful aeruginous blue; adheres strongly to paper, exhibiting a glossy surface ; filaments expanding by moisture so as to seem recent, and sometimes resuming the oscillatory mo-tion. Hab, Lake at Glaslough, County Monaghan, Ireland. Belfast, August 14, 1837. II. — Some Remarks on the Germination of Limnanthemum la-cunosum. By Dr. Grisebach. [With a Plate.] When I was preparing a year and a half ago a monograph on the Gentianece, I ventured to hope that my endeavours would be furthered by the assistance of such botanists as have larger materials at their disposal, this being the spirit of a science whose followers seem to participate in that bountiful and tran-quilly working principle which reigns over the Vegetable Creation. Far from finding myself disappointed in these views, I have received everywhere the most liberal, generous, and disinterested support ; and am only anxious lest my labours should not correspond with the unparalleled confidence which some of the most eminent naturalists were kind enough to show me. Among the very rich collections of Gentianece be-longing to Sir Wm. J. Hooker, all of which he entirely en-trusted to me by sending them hither, there were germina-ting specimens of Limnanthemum lacunosum, ( Villarsia, Vent.)
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