Percentage of 

The Morphology of Ruppia Maritima. 
RELATIVE RESISTANCE TO PLASMOLYSIS. 









LEAF (epidermal cells) ROOT (root hairs) 
E 
‘ . 1 . 
3 Elodea cana- ee Ruppia Elodea ee Ruppia 
aD) densis 4.:, |Maritima| canadensis =, | maritima 
palustris palustris 
10 _- -- - — -- - 
20 — - — - — 
30 : — — 
40 - very slight _ 
very gradual gradual, 
50 | appearing in \ but finally gradual 
about 7 min. | marked 
, very rather grad- Pethee 
60 |bet. 40s. & 2 mJ eradual ual butfinal- Fee 
Nes 9 m. ly marked | © ; 
70 35-—75 s. is ae ES - 1 min. distinet 
2 
80 12—15 s. 45 s.—3 m. — 1 a0). -— 
90 |10 s. & under ie a - 30 s. = 
peti 
100 immediate 15—45 s. -- 20 s. - 
105 immediate ale Pieces immediate occasionally 
: ont mediate viper. Se On very slight 
care distinct rather slow 
110 immediate | | adiate (2nd fairly) immediate — but finally 
rapid distinct 

Comparison with Results of Prof. Ganong | 
on Root Hairs of Land Halophytes! 


plas- 
molysis 



| g d 
; ; : 2 
Salicornia} Suaeda |Plantago| Atriplex | 2 & 
ei Pit p <= 
herbacea |maritima! maritima} patulum Bo 
5 
Hye, 
plas- 
plasmolysis | mo- 
lysis 
plasmo- 
lysis 
plas- 
molysis 
1 Ganong, in all cases, gives the 
solution which the plant will 
“endure without plasmolysis.” I 
assume, therefore, that plasmolysis 
would occur at the next puget 
strength of solution. 
