1900] OBSERVATIONS ON LESSONIA 323 
how the Gauchoes use the cartilaginous stem for knife-handles ; 
- atthe same time he gives, especially for Lessonia ovata, an 
extremely useful and accurate discussion of the morphology, 
and does not fail to point out several important histological 
facts upon which, in general, later accounts have been based. 
The most extensive anatomical study in the genus with which | 
am familiar is that of Grabendorfer,* whose results in a general 
_ «my would apply to Lessonia littoralis as well as to the species 
_ of his investigation, Lessonia ovata. The figures given by him, 
five in number, illustrate but scantily the anatomical structure of 
- the genus. I assume, also, that they were made from dried 
material, and the very different detail which I have found, and 
pesent in the accompanying plates, may be regarded as the result 
of studying material practically equivalent to fresh. The method 
of preserving large alge in use at the University of Minne- 
Sota has not yet broken down in a single instance, although over 
‘thousand jars of formalose material are on the shelves. Four 
Percent. solution of formalose is used, but after the first few 
months the jars are opened and fresh preservative substituted. . 
After this it is our experience that disintegration does not occur. 
Other literature which has been used in the study of this 
Plant and has been more or less helpful is cited below.’ 
4 ra 
oo ohaabe Beitr. zur Kenntniss der Tange. Bot. Zeit. 43: 641. 1885- 
1893, JELLMAN: Laminariaceze in Engler and Prantl Pflanzenfamilien I. 2: 242. 
eset 8 ha Wanderung der anorganischen Niahrstoffe bei den Laminaria- 
Wa. % = fiir Schwendener. Berlin. 1899. 
“E+ Beitr. die Phys. Anat. die Laminaricee. Christiania. 1897. 
yllum. Marburg. 
OSEN : : ; 
Mo, TAL: Zur Kenntiss von Macrocystis und Thalassioph 
R 
3 Rup : . 
1 hy tab Pflanzen aus dem nérdlichen Theile des stillen Oceans. 
REINKE: Rast: 
— qlee zur Kenntniss der Tange. Pringsh. Jahrb. 10+ 37% 1876. 
Wi. E:7 leve-tubes in Laminariew. Ann. Bot. 1:95- 18 
Serene, Si Anatomie von Macrocystis luxurians. B 
iacer, oS the classification and geographical 
Mac) *Lonn. Acad. 9: 333. 1893. 
MILLAN : Observations on N ereocystis. Bull. Torr. Bot. Club 26 : 273. 1899- 
87. 
ot. Zeit. 42: 80. 1884. — 
distribution of the Lami- 
