Index of Hosts 177PAGE PAGE

Lucerne (Medicago sativa) 148 Rose (Rosa) 169Runner Bean (Phaseolus) 149

Mangold (Beta) 152 Rye (Secale) 145Medlar (Mespilus) . . 162 Rye Grasses (Lolium) 146Melon (Cucumis Melo) . 167Michaelmas Daisy (Aster 168 Sainfoin (Onobrychis) 148Mint (Mentha) . 159 Salsify (Scorzonera) 158Mulberry (Morus) . 166 Seakale (Crambe). 155Mushroom (Psalliota) 174 Shallot (Allium ascalonicum) 154

Snapdragon (Antirrhinum) . 169Narcissus. ..... 172 Snowdrop (Galanthus) 172Nectarine (Prunus persica) . 164 Spinach (Spinacia) . 159

Strawberry (Fragaria) 165Oats (A vena) . 144 Swede (Brassica) . 151Onion (Allium Cepa) 153 Sweet Pea (Lathyrus) 169

Sweet William (Dianthus bar-Paeony (paeonia) 168 batus) 170Pansy (Viola) . 170Parsnip (Pastinaca) 157 Timothy (Phleum) 146Pea (Pisum). . 149 Tobacco (Nicotiana). . 174Pea, Sweet (Lathyrus) 169 Tomato (Lycopersicum) . 158Peach (Prunus persica) 164 Trefoil (Medicago lupulina). 147Pear (Pyrus communis) 161 Tulip (TuliPa) 171Pelargonium . .... 168 Turnip (Brassica) 151Pink (Dianthus Caryophyllus) 167Plum (Prunus domestica) . 162 Vegetable Marrow (Cucurbita) . 156Potato (Solanum tuberosum) 149 Vetches (Vicia) 148

Vine, Grape (Vitis) 166Quince (Cydonia) 161 Viola 17°

Violet (Viola odorata) 170Radish (Raphanus) . . . 155Radish, Horse (Cochlearia) . 155 Wallflower (Cheiranthus) 170Raspberry (Rubus I daeus) . 164 Walnut (Juglans) 167Red Currant (Ribes rubrum) 165 Wheat (Triticum) 143Rhododendron 171 William, Sweet (Dianthus bar-Rhubarb (Rheum) 174 batus) 170

REVIEW.Hymenomycaes de France iHeterobasidies-Homobasidiee gymno­

carpes). By H. BOURDOT and A. GALZIN. Pp. iv, 761; 185figs. in text. Paris: P. Lechevalier, 1928. Frs. 150.

During the past twenty-five years our knowledge of the lower Basidiomyceteshas made enormous strides. The Abbe Bresadola, with his careful and accuratedescriptions of microscopic characters, broke new ground in the study ofthese forms. He has been followed by others, notably by von Hoehnel andLitschauer in Austria, by Burt and Overholts in America, and by Bourdot inFrance. The series of monographs prepared by the Abbe Bourdot in con­junction with the late M. A. Galzin, which began in 1909 and have continuedto the present, day, have been long regarded as indispensable for the deter­mination of European Heterobasidieae, Thelephoraccae, Hydnaceae, etc. Theearlier papers have necessarily become out of date with increasing knowledge.Hence the announcement that a revised edition, in book form, oftheHymenomy­cetes de France was in preparation was welcome news to all those interested inthese groups.

The present volume, published under the auspices of the Societe Mycologiquede France, is a wonderful record of many years' work by M. Galzin, the

Transactions British Mycological Society

indefatigable collector, and the Abbe Bourdot, to whom all his collections weresent.

Bourdot and Galzin follow in its broad lines the classification proposed byPatouillard in his Essai taxonomique, and the present volume includes the"Basidiomycetes heterobasidies," with the sections Exobasidiaceae andAphyllophoraceae of the" Basidiomycetes homobasidies " of that arrangement;that is, all Hymenomycetes other than the Agaricaceae.

The extraordinary progress which has been made in recent years in the studyof species is revealed by examination of the numbers included in certain genera.For instance, under Corticium and Gloeocystidium are enumerated no less than165 species and sub-species, and under Peniophora 102, as against 99 and 66respectively in the earlier papers of 19II and 1912. Even more startling is thelist of 53 species of Hypochnus (here called Tomentella). There is moreover noquestion that most of Bourdots new species are well-founded and recognisableby other workers. It is interesting to compare these figures with the speciesrecorded for Britain. In Rea's British Basidiomycetae and Supplement thenumbers are: Corticium (including Gloeocystidium), 48; Peniophora, 3I;Hypochnus, 21. As it is probable that many of the Continental forms occuralso in this countrv, it is obvious that there is still room for much valuablework by those who are willing to give the time and patience necessary forcollecting these lowly forms.

Keys are provided for the determination of genera and species. Perhapsfrom considerations of space, the authors have adopted the numerical form ofkey, as used by Burt in his Thelephoraceae of North America. This is much lessconvenient in use than the more natural form used in the earlier papers in theBull. Soc. Myc. France, and it is unfortunate that this earlier form could nothave been retained.

Each species is given a careful and detailed description, supplementedfrequently by valuable ecological notes based on field observations. In manycases small text-figures, showing the principal microscopic characters, havebeen added.

It is inevitable that followers of the International Rules of Nomenclatureand of the Type-basis Code should differ from the school of Patouillard in suchmatters as the use of Phylacieria for Thelephora and Tomentella for Hypochnus.Apart from such matters of opinion, however, one can find little to criticisein the work under review. It will undoubtedly rank as one of the classics oftaxonomic literature.

The work is printed in clear type in a large 8vo form, and is provided witha complete index of the families, genera and species dealt with, with theirsynonyms. The price is moderate for a book of this class.

E.M.W.