of abnormally high water we have looked 

 in vain for certain species of Nitella and 

 Algae, although they were abundant both 

 before and after such seasons. The high 

 water changes the light conditions which 

 are so essential to certain species that they 

 are incapable of developing. 



Most of the species of filamentaceous 

 Algae in this list have been preserved 

 upon microscopic slides. The most satis- 

 factory presendng fluid for this purpose 

 we have found to be one made up as 

 follows: glycerine, 1 part; water, 2 parts; 

 alcohol, 3 parts. 



The specimens to be mounted are placed 

 in small amounts of this solution con- 

 tained in a watch-glass where they are left 

 until the water and alcohol has evapo- 

 rated. After this has taken place they 

 are laid on a slide and ringed and sealed. 

 When this process is carried through rap- 

 idly, that is in three or four hours, and 

 the specimens are kept in the dark, they 

 vnll hold most of their color and form 

 tolerably well for many years. 



G. E. STONE. 

 Mass. Agricultural College, July 1, 1899. 



SPERMAPHYTES. 



Kanunculus. 



Aquatilis, var. trichophyllus, Gray; 

 multilidus, Pursh. 



Brasenia peltata, Pursh. 



Nymphea. 



Odorata, Ait; odorata, var. minor, 

 Sims. 



Nuphar. 



Advena, Ait; *Kalmianum, Ait. 



Nasturtium officinale, R. Br. 



Elatine Americana, Arn. 



Myriophyllum. 



Spicatum, L; verticil] atum, L; am- 

 biguum, Nutt; tenelluni, Bigelow. 



Proserpinaca palustris, L. 



Callitriche. 



Verna, L; *heterophylla, Pursh. 



Decodon verticillatus. Ell. 



Ludwigia palustris, Ell. 



Slum Carsonii, Durand. 



Bidens Beckii^ Torr. 



Lobelia Dortmanna, T;. 



Limnanthemum lacunosum, Grisebach. 



TJtricularia. 



Inflata, Walt; *clandestina, Nutt; 

 vulgaris, L; minor, L; gibba, L; in- 

 termedia, Hayne; purpurea, Walt; 



*resupinata, B. D. Greene; comuta, 

 Michx. 



Polygonum amphibium, L. 



Ceratophyllum. 



Demersum, L; demersum, var. echi- 

 natumi, Gray. 



Elodea Canadensis, Michx. 



*Vallisneria spiralis, L. 



Pontederia cordata^ L. 



Juncus militaris, Bigel. 



Typha latifolia^ L. 



Sparganium. 



Eurycarpum, Engelm; simplex, Hnds; 

 simplex, var. angustifolium, Engelm; 

 simplex, var. androcladium, Engelm; 

 minimum, Fries. 



Peltandra undulata, Raf. 



Spirodela polyrrhiza, Schleid. 



Lemna. 



*Minor, L; *triisulca, L. 



Alisma Plantago, L. 



Sagittaria. 



Variabilis, Engelm; variabilis, var. 

 angustif olia ; variabilis, var. obtusa; 

 variabilis, var. gracilis; graminea, 

 Michx. 



*Scheuchzeria palustris, L. 



Potamogeton. 



Natans, L; natans, var. prolixus, 

 Koch; Oakesianus, Pobbins; Penn- 

 sylvanicus, Cham; Vaseyi, Robbins; 

 Spirillus, Tuckerm; hybridus, Michx; 

 fluitans. Roth; pulcher, Tuckerai; 

 amplif olius, Tucl< erm ; heterophyllus, 

 Schreb; heterophyllus, var. myrio- 

 phyllus, Robbins; perfoliatus, L; ob- 

 tusif olius, Mer. & Koch; pauciflorus, 

 Pursh; pusiiius, L; pusillus, var. ten- 

 uissimus, Koch; pusillus, var. poly- 

 phyllus, Morong; gemmiparus, Rob- 

 bins; Tuckermani, Robbins; Rob- 

 binsii, Oakes. 



Naias. 



Flexilis, Ros. & Sehm.; indica, var. 

 gracillima, A. Br. 



Eriocaulon septangulare, Withering. 



Eleocharis. 



Robbinsii, Oakes; palustris, R. Br. 



Scirpus. 



Subterminalis, Torr; pungens, Vahl; 

 Torreyi, Olney; lacustris, L; sylvati- 

 cus, L. 



Spartina cynosuroides, Willd. 



*Zizania aquatica. L. 



PTERIDOPHYTES. 



Equisetum limosum, L. 

 I'soetes. 



Lacustris, L. 



Echinospora, var. Braunii, Engelm: 



riparia, Engelm. 



BRYOPHYTES. 



Sphagnum. 



Cuspidatum, Ehrh ; cymbifolium, 

 Ehrh. 



