259 
number is evidently somewhat less than those so indicated in recent 
American text-books), this work of Herr Richter has an import- 
ant bearing on our own Flora, and it is doubtless the most im- 
_ portant contribution yet ‘made towards establishing the priority - 
of original names on the continent of Europe. We presume that 
the work will have little acceptance in England, but Herr Richter 
will have the support and the cordial thanks of nearly every 
American botanist. It now remains for some one to produce a 
similar work for North America. ha Oe OG 5 8 
Sur la tige des Zostera; par M. C. Sauvageau. (Journ. de Bot. 
V. me. annéé, p. 33). 
The anatomical structure of the five known species of Zostera 
were studied and the differences in the stem structures were 
found sufficiently marked to be of value in the determination of 
the species. 
Zostera marina, L. is distinguished from 2. Capricornz, Asch. 
and Z. nana, Roth, by the structure of the stem; 7. mana and 
Z. Muelleri, Irmish, are more easily separated by an examination 
of their leaf-structure than by that of the stems. A transverse 
section of their stems will prove that 2. A/uelleri is an independ- 
ent species, and not, as some authors have asserted, an Australian 
variety of 7. ana. Inversely, Z. nana and Z. Capricornt show 
greater differences in their leaf than in their stem structure, and 
Z. Tasmanica, G. v. Martens, is easily separated by an examination — 
of the stems from Z. Muelleri, which it resembles in structure. 
Recherches Anatomiques sur le Genre Carex: par. M. Bordet. 
(Revue Gen. de Bot. iii. 57.) 
The anatomical study of rhizomes of the genus Carex admit 
of its being divided into four groups, the two first characterized 
by ligneous ducts, collateral or concentric, the two others by a 
bark formed of small intercellular spaces or showing air ducts. 
The size and relative number of the woody ducts in the fascicles 
should be taken account of. As regards the lacune and scleren- 
chyma, which often depend on age and exterior surroundings, 
the author does not agree with M. Laux* in drawing classificatory 
* Beitrag zur Kentniss der leitbundel in Rhizom monocotyler Pflanzen. Ver. 
Bot. Brand., 1888. : : 
