304 PHYSIOLOGICAL BOTANY. 



rend. 1844, i, p. 93. This paper contains a statement to 

 the effect, that stomata exist upon the leaves and young 

 stems of Clandestina Europ&a. There is a Report upon 

 the complete Memoir in the ' Compt. rend/ 1845, i, 

 p. 1268. The so-called etui medullaire is absent in Clan- 

 destina, neither do medullary rays exist. 



Note upon Orobanche Erynyii, Vaucli. By M. P. Du- 

 CHARTRE. Ann. des Scienc. nat., 3 ser. vol. iv, p. 74. 

 This plant is furnished with stomata. On the absence 

 of medullary rays. 



In the second part of my ' Lectures on Botany/ many 

 details regarding the structure of the stem are contained, 

 which, as far as I am aware, are not stated elsewhere. 

 It was my wish not to have spoken of them when treat- 

 ing of the stem in this Report, because I have been found 

 fault with for having alluded too frequently to myself. 

 But I was very anxious that many points, as e. g. the 

 wedges in the wood and in the bark, and the difference 

 between them, and their difference from the medullary 

 rays, should not be overlooked. 



FERNS. MOSSES. LICHENS. ALG.E. FUNGI. 



New Species of the Genus Isoetes, from Algeria. De- 

 scribed by BORY ST. VINCENT. Compt. rend. 1844, 

 i, 1167. They consist in addition to Isoetes Delilii, of 

 Is. longissima, from bogs, and /. Duriei and Hystrix, 

 terrestrial species. Bory quotes Cl. Richard as having 

 stated that the Isoetese should constitute a separate 

 natural order; this would also apply to Salvinia and 

 Pilularia. Roeper in his Flora of Mecklenburgh, pt. i, 

 1843, which contains much excellent matter, particularly 

 special remarks upon Ferns, has censured me for arranging 

 the Lypodiacese among the Ferns, and the same may be 

 said of the Equisetacese. But I should wish the whole 

 to be united into one class, because the orders composing 



