34 



M. Mohl on the Power of the Living Plant 



Betula intermedia, Thorn. 



B. fruticulosa, Valil ? Thing- 

 valla. 

 B. nana. Thingvalla. 

 Salix glauca, Linn., not Sm, Reine- 



valla-hals. 

 S. phylictfolia. Thingvalla. 

 S. lanata. 

 S. pyrenaica var. norvegica, Fries. 



Reinevalla-hals. 

 S. herbacea. 



OrchidacecB. 

 Orchis latifolia. 

 Habenaria viridis. 

 H. hyperborea. 



Melanthacece. 

 Tofieldia palustris, Huds. 



Juncacece. 

 J uncus balticus. Is this the /. effu- 



sus of Hooker's Fi., or J. arcticus 



ofVahl'sList? 

 J. supinus. 

 J. bufonius. 

 J. trifidus. 

 J. triglumis. 

 Luzula spicata. 

 L. multiflora. 



Alismacece. 

 Triglochin palustre. 



Aroidece. 

 Sparganium natans. 



Potamogetonece. 

 Potamogeton lanceolatus, Sm. 



P. nigrescens, Fries. 

 P. filiformis. Maria Havn, Hval 



Fiord. 

 Zostera angtistifolia, Reich. 



Cyperacece. 

 Scirpus csespitosus. 

 Eleocharis uniglumis. 

 Eriophornm capitatum. 

 E. polystachion y. elatius, Koch. 

 Elyna spicata. 



Carex dioica. 



C. chordorhiza. Maria Havn, Hval 



Fiord. 

 C. incurva. 

 C. curta. 

 C. atrata. 

 C. capillaris. 

 C. vaginata. 

 C. rariflora. 

 C. cryptocarpa, Meyer. 



C. filipendula, Drej. 

 C. vulgaris, Fries. 

 C. hyperborea, Drej. 

 C. rigida. 



Graminea. 



Anthoxanthum odoratum. 



Alopecurus geniculatus. 



Phleum commutatum. 



Agrostis alba. 



Arundo stricta. Near the Geysers 



and at Maria Havn, Hval Fiord. 

 Sesleria caerulea. 

 Aira alpina. 



Trisetum subspicatum /3. ciliatum. 

 Poa annua. 

 P. pratensis. 

 P. alpina. 



P. Balfourii, Parn. 

 P. caesia. 



P. ccesia /3. glauca. 

 Festuca ovina. 

 F. rubra y. arenaria. 



Equisetace.ee. 

 Equisetum umbrosum. Thingvalla, 

 E. palustre. 



Filices. 

 Polypodium Dryopteris. 

 P. Phegopteris. 

 Woodsia ilvensis. 

 Athyrium Filix-fcemina. 

 Cystopteris fragilis a. 

 C. fragilis /3. dentata. 

 Botrychium Lunaria. 



Lycopodiacea?. 

 Lycopodium selaginoides. 



VIII. — On the Power of the Living Plant to restrain the Eva- 

 poration of the Cell-Sap. By Hugo v. Mohl*. 



It is a known fact, attested by numerous weighings, that the 

 living plant, when exposed to light (even diffused daylight, 



* Botanische Zeitung, May 7, 1847. Translated by Arthur Henfrey. 



