NOTICES OF BOOKS AND MEMOIRS. 255 



characters well under cultivation, and that at Monmouth the two 

 grew together without any intermediates being seen. Mr. Brother- 

 ston has a note on Potamo/jeton Zizii/'' from which it. appears that 

 the same plant is recorded as P. decipiens (from an imperfect 

 example sent by Mr. Borthwick in 1869) by Prof. Babington, in the 

 7th edition of his ' Manual,' and was named P. heterophyllus by 

 Dr. Boswell (Syme) in 1875, but now considered by him "typical 

 oiitens.'" Prof. Babington now names it Ziui, and, as will be seen 

 from the Exchange Club Keport, Mr. Baker agrees with him in so 

 calling it. We have latety had the opportunity of examining 

 Mr. Brotherston's specimens and comparing them with numerous 

 continental examx3les, and can fully confirm this nomenclature. 

 We hope soon to give a figure and description of this interesting 

 critical Pondweed. A novel feature in the Eeport are the 

 Bryological Lists, three of which are here given as a first instal- 

 ment — West Cornwall, East Cornwall, and North Lincolnshire. 

 The Editor insists absolutely on the rule that every species-name 

 recorded must be represented by a sufficient specimen. 



Mr. Hemsley has issued a second part of his ' Diagnoses ' of 

 new Mexican and Central American x^lants, dated July, 1879. 

 There are about 80 new species described ; and a new genus of 

 BignoniacecB from Panama, Godmania (founded on Cyhistax macro- 

 c«rjj«, Benth.) is dedicated to the ■ liberal naturalist and traveller, 

 Mr. F. D. Godman. There is also a revision of the Central 

 American species of Piondeletia. 



In ' Contribuciones a la Flora de Paraguay,' Fasc. 4, Senor 

 Parodi describes systematically the species of Psidium, pAKjenia, 

 Myrcia, and Myrtus. Nearly all, i.e. 70, are apparently new, and 

 are described in Latin, but the author has scarcely in any case 

 affixed a specific name, refraining, it would appear, lest he should 

 add to the existing confusion of nomenclature. 



We note with satisfaction the continuation, after an interval, of 

 Baillon's fine ' Dictionnaire de Botanique,' by the issue of the first 

 part of vol. 2. It maintains its excellence fully, but it may 

 be a question whether such long articles as Dr. Lanessan's on 

 Chlorophyll (pp. 17), and Circulation (pp. 23), are not rather out of 

 place in a dictionary. 



The plates and descriptions of species of chief botanical interest 

 in Bentley & Trimen's ^Medicinal Plants' (Parts 38-40) are — 

 Gossypiuin harhadense, Dorema Ammoniacum, Hibiscus esculentus, 

 Dichopsis Gutta, Metroxylon Sagu, Smilax officinalis, S. medica, Cin- 

 namomum Cassia, Cichona officinalis, C. succiruhra, C. Calisaya, Aloe 

 succotrina, A. spicata, Balsamodendrum Myrrha, Gracilaria lichenoides. 

 Two more parts will complete the work. 



* This species is referred to '-Boreau" in the Keport; but Boreau treats it 

 as a variety of P. heterophyllus, Schreb. The authors' of P. Zizii as a species 

 are Mertens and Koch ; the latter afterwards considered it as merely a variety, 

 but Reichenbach and Lange have restored it to specific rank. In the Exchauge 

 Club Report " C. & S." are credited with the species, but'Chamisso and 

 Scblechtendal also made it only a variety of their P. Proteus, which included 

 P. heterophyllus and P. lueeus. 



