3U NOTICES OF BOOKS AND MEMOIRS. 



Flora of Tropical Africa, By D. Olh^r, assisted bv other Botanists. 

 Vol. III. Loudon: L. Reeve. (Pp.544.) 

 This volume was published last October. It contains the orders 

 Iliihcllifcnr and AraUacc<r by Mr. Hiern, which were printed so long 

 back as 1871 (with the second volume), though only now published ; 

 the lluhiaceff, Yalerianacca' and Dipsacetr, all also by Mr. Hiern ; the 

 Composite^ by Prof. Oliver and Mr. Hiern ; the Goodenoric^p, hj Mr. 

 Hieru ; the Campanulacea by Mr. Hemsley ; the EricacecB, Plnmba- 

 flincd', and PrimnlacecB by Prof. Oliver ; the Mi/rsinea; and Scqjotacere 

 by Mr. Baker ; and the Khcnace(B by Mr. Hiern. The bulk of the 

 volume is, of course, occupied by the great Orders Iluhiacea and Com- 

 posiur : statistics relating to the former have recently been published 

 by Mr. Hiern in the ' Journal of the Linnean Society.' H. T. 



Prof. Perceval Wright, in the * Transactions of the Royal Irish 

 Academy,' vol. xxvi., has described and figured a chlorophyllous 

 unicellular Alga, which is parasitic within the muc us tubes of 

 Scliizonema Dillwynii and Colletonema vulgare, and the cells of 

 Calothrix confervicola and Polysiphonia urceolata. Colin described 

 in 1872, under the name of Chlorochytriiim Lemnm, a green ento- 

 phyte in Lemna-fronds ; and Prof. Wright provisionally places his 

 plant under the same genus (as a second species, C. Cohnii, sp. nov.) 

 in preference to making a new one, though he states that the pro- 

 cess of the formation of the zoospores is quite different, and that 

 two kinds of zoospores, large and small, occur. 



In another memoir, Prof. Wright, in describing a new species 

 of Chytridiaceae, Rhizophydium Dicksonii, parasitic in the cells of 

 Ectocarpns granulosus, shows that it is probable that some of the 

 " utricular " fruits of Harvey and spores of Kiitzing are, in the true 

 Ectocarjn, in reality i)arasitic Chytridia. 



Prof. Farlow, of Harvard University, continues, in the * Bulletin 

 of the Bussey Institution,' his notes on diseases caused by Fungi. 

 A plate is given of JJncinula spiralis, a common mould on Vines, 

 especially in the Western States, where it has caused some damage : 

 its conidial form is stated to be practically indistinguishable from 

 Oidiiim Tuchcri, the grape-mould of Euro^^e. Dr. Paiiow also, m 

 the ' Proceedings of the American Academy,' supplements his list 

 of United States Marme Algae, published in 1875. Many are from 

 the west coast, and there are several novelties from California. 



Mr. HiLLHousE publishes a list of Bedfordslm-e plants in the 

 ' Transactions of the Nat. Hist. Society' of that county, embody- 

 ing the additions during 1876. The total of Phanerogams is 

 nearly 700. 



In tlie ' Annales of the Lyceum of Nat. Hist, of New York ' 

 (vol. xi., no. 12) is a catalogue of the Myxomycetes of the 

 United States, arranged according to Rostafinski's system by 

 Mr. M. C. Cooke. 



The 2nd Part of vol. xiii. of ' Hooker's Iconcs Plantarum,' 

 dated Dec. 1st, contains plates 1226-1250. Several interesthig 



