124 NOTICES OF BOOKS AND MEMOIRS. 



■ 



growth of the hyphae, these hyinenial gonidia increase in size, and 

 ultimately act as the thaUus-gonidia of the new lichen. A further 

 experiment, which in its result conclusively proved this was the 

 isolated cultivation of the spores of a species of Thelidium with the 

 hymenial gonidia of a Denr.atocarpon : — the hymenial gonidia of 

 the Dermatocarpon belong to the same species of P lc itro coccus as 

 those of the Thelidium. In time Dr. Stahl obtained the thallus of 

 the Thelidium complete as regards gonidia and fructification, thus 

 showing that the same species of alga served as the gonidia of two 

 totally different Fungi. From these observations it will be seen 

 that the minute hymenial gonidia are closely associated with the 

 spores, both in the apothecium and in the free state. It is in this 

 association, as observed with probably defective eyesight, or with a 

 bad objective, or with both, that the explanation must be sought for 

 a series of mistakes unparalleled in our experience of botanical 

 literature. The upholders of the views of Schwendener will welcome 

 this book, but the majority of lichenologists will reject it as calcu- 

 lated to bring lichenology and its methods into contempt. G. M. 



Undee the title ' Botany for Children,' the Rev. G. Heuslow 

 has recently issued "an illustrated elementary text-book for junior 

 classes and young children," which is intended to precede Professor 

 Oliver's 'Lessons in Elementary Botany.' We should hardly have 

 thought this necessary ; and we do not quite see in what principle 

 Mr. Henslow has gone in his selection of Natural Orders. Only 

 twenty-five of these are chosen for illustration, the others being 

 omitted on account of want of space ; among the omissions are the 

 UmbeUifem, Mah-acca, Borragmaeea, and Scrophul ariaccir . The 

 little book is well up to date, and there is a good index of terms ; 

 the illustrations strike us as being, in many instances, hard and 

 clumsy, although they sometimes show points not often attended 

 to in so elementary a book— e.,j., at t. 3, where the apetalous 

 flowers of Viola are well shown. 



Me. J. E. Gbiffith, of Bangor, has commenced a 'Flora of 

 Carnarvonshire and Anglesea ' in the < Naturalist.' So far as we 

 can judge from this first instalment, the enumeration of species is 

 not intended to be critical, nor are the localities given very 

 numerous ; while it is strange to find such species as Hellebonts 

 jmuius and Limim mitatissimum included among British plants 

 witn no note of suspicion suggests. The author does not say 

 wuether he is himself responsible for the record of the species in 

 the various localities. 



A Floba of Hitchin has been commenced in the 'Herts 

 impress during last month ; it contains localities for the plants of 

 the neighbourhood. The statement that "a fitting and competent 

 person is .lacking" for the task of compiling a new Flora of 



Jlertfordshirf* vpnnMo „~ i- _ *r ^ r . ,<? r T»-ij~»lr 



U^i-e j i- °. " c tHbK OI compiling a new xiux«, •» 



Hertfordshire requires correction. Mr. R. A. 1W, of Baldock, 

 is engaged upon this work, and has already made large collections 

 towards it: he will b« aUA +n ,. — u~ „™„. a. <,™vmie 



i "•," ., x . .,; "«»*> »uu una aireaay maae large couet^"- 



tou aids it : he will be glad to receive assistance from anyone 

 acquainted with the botany of the county. 



