258
H. WALTER AND E. STADELMANN
Fig. 25. Small specimen of Ferocactus wislizenii (from Walter, 1931, p. 141,
Fig. 61; photograph by E. Walter).
Fig. 26. Stem cross section of Ferocactus wislizenii. N, north; S, south; W,
west; E, east. The dotted lines connect points with the same osmotic potential.
The numerical value (in atm) is indicated for each line in parenthesis. The results
of individual measurements are given without parenthesis. Note the proximity of
the ribs in the southwest-exposed region (from Walter, 1931, p. 142).
H. WALTER AND E. STADELMANN
Fig. 25. Small specimen of Ferocactus wislizenii (from Walter, 1931, p. 141,
Fig. 61; photograph by E. Walter).
Fig. 26. Stem cross section of Ferocactus wislizenii. N, north; S, south; W,
west; E, east. The dotted lines connect points with the same osmotic potential.
The numerical value (in atm) is indicated for each line in parenthesis. The results
of individual measurements are given without parenthesis. Note the proximity of
the ribs in the southwest-exposed region (from Walter, 1931, p. 142).