Reviews and Book IVofices. 



29 



mycologists to remove such from the Ust, by connecting them 

 with the higher forms to which they belong. If such work 

 cannot be carried out to finality, yet much can be done in the 

 field and at home to suggest such affinities. All the Hypho- 

 mycetes, popularly known as moulds, are only forms, not 

 entities, the same is true of the species of PJioma, Cladosporium, 

 etc. If the substance on which these are growing is kept under 

 observation, it may be for weeks, or even months, a second 

 stage will follow the first. If this sequence of development 

 is constantly repeated, it is highly probable — but not definite 

 proof — that the two forms are related to each other. The 

 definite proof consists in producing one stage from the spores- 

 produced by the alternate condition, a work of no insuperable 

 difficulty. 



During the summer our plane trees are often defoliated 

 early in the season, owing to a minute fungus called Glceos- 

 poriiim nevvisequum. In the spring a second form of the fungus 

 appears on the wounds made by the first on the dead fallen 

 leaves. This second form was known as Pseudopeziza platani. 

 In consequence, the name Glceosporiuui is dropped, as it is known 

 to be only a stage of the ascigerous Pseudopeziza. 



Our object up to the present has been to obtain the greatest 

 possible number of names of Fungi inhabiting Yorkshire. 

 Our future ambition should be to reduce the list of names as 

 much as possible, along the lines indicated above. 



It may be thought that the Agarics are not included in the 

 category of duplicate forms. This is not so, many so-called 

 moulds are only the conidial forms of Agarics.* 



o-c- 



National Museum. The Danish Collection : Pre=historic Period. 

 Guide for Visitors, Copenhagen, Prepared under the direction of Dr.. 

 G. A. Auden. 1908. [58 pp., not numbered]. 



The great majority of English visitors to the well-known Museum at 

 Copenhagen are unfamiliar with, the Danish language, and consequently 

 do not reap the full benefit from a perusal of the unrivalled collections there 

 exhibited. Recently a German edition of the guide-book appeared, dealing 

 with the pre-historic section, and thanks to Dr. Auden, there is now an 

 Englisli edition. Tiiis is a concise account of the chief objects of interest 

 in this rich institution, and the more important specimens are figured. Per- 

 sonall}" we should like to thank Dr. Auden for this further evidence of 

 his practical interest in the study of Archa?ology ; and, at the same time,, 

 we must record our regret that iie has left the north, where his help was 

 needed. 



* In addition to these useful and suggestive preliminary remarks,, 

 we hope shortly to print an account of the life-history of the Thielavia,. 

 with figure, by Mr. Massee. 



igog January i. 



