Reviews 317 mentioned that M edusomyces referred to in a footnote has been shown by Lindner and others to be a compound "organism" owing its gelatinous consistency to Bacterium xylinum. A summary of the key is given in the last six pages. There are numerous text-figures which, though rough, serve their purpose. J. R. Die Pilze Mitteleuropas. Bd.1. Die Rohrlinge (Boletaceae). By F. KALLENBACH. Lief. 6 and 7, pIs. IS, 16, 17, 18 and 23, PP·29-44· The plates in these further instalments of the Boletaceae deal respectively with Boletus luridus (IS and 16), B. elegans-flavus (17), B. viscidus (18), dissections of these species, and habitat photographs of B. luridus and B. luteus (23). The text of eight pages does not quite complete the account of the first three species. The great variability of B. luridus is well depicted but the form with the olivaceous umber pileus which is regarded as typical in this country is unaccountably absent, though the very rare form with sulphur-yellow pores is figured. Boletus flavus (With. 1796) Fr. 1835 is regarded as synonymous with Boletus elegans Fr. (non Schum.) Fr. 1836-38 and the var. pulchella dropped. It appears from the order of the names on the plates and from an occasional slip in writing elegans that the author would have preferred to use this name. The figures well represent the range of the species as seen with us. Great insistence is put upon its occurrence under larch. Fries in 1874 says" semper sub Larice," but it is certain that in this country though almost always under larch it is not invariably so, though how one is to provide Melin with the II kritische Nachprtifung" he demands is difficult to see. The plate of Boletus viscidus shows the fungus in the forms well known to British mycologists. It is said to occur under larch but less frequently than B. flavus. One's impression is that there is little to choose between the two in that respect here. A point of interest to those studying mycorrhiza is that B. viscidus sometimes forms a ring round the bole of the larch. I have known one in Surrey for several years, the fruit-bodies appearing in wet summers in July. The publication maintains its high standard of production. J. R. Mycorrhiza. An account of non-pathogenic infection by fungi in vascular plants and Bryophyta. By M. C. RAYNER. New Phytologist, Reprint No. IS. Wheldon and Wesley, Ltd. 1927. 246 pp., 7 pIs., 64 text-figs. Botanists in general will welcome this summary of our know- ledge of mycorrhiza, that strange association of fungus and

Die Pilze Mitteleuropas. Bd. I. Die Rohrlinge (Boletaceae). By F. Kallenbach. Lief. 6 and 7, pis. 15, 16, 17, 18 and 23, pp. 29–44

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Page 1: Die Pilze Mitteleuropas. Bd. I. Die Rohrlinge (Boletaceae). By F. Kallenbach. Lief. 6 and 7, pis. 15, 16, 17, 18 and 23, pp. 29–44

Reviews 317

mentioned that M edusomyces referred to in a footnote has beenshown by Lindner and others to be a compound "organism"owing its gelatinous consistency to Bacterium xylinum. Asummary of the key is given in the last six pages. There arenumerous text-figures which, though rough, serve their purpose.

J. R.

Die Pilze Mitteleuropas. Bd.1. Die Rohrlinge (Boletaceae). ByF. KALLENBACH. Lief. 6 and 7, pIs. IS, 16, 17, 18 and 23,PP·29-44·The plates in these further instalments of the Boletaceae deal

respectively with Boletus luridus (IS and 16), B. elegans-flavus(17), B. viscidus (18), dissections of these species, and habitatphotographs of B. luridus and B. luteus (23). The text of eightpages does not quite complete the account of the first threespecies. The great variability of B. luridus is well depicted butthe form with the olivaceous umber pileus which is regarded astypical in this country is unaccountably absent, though the veryrare form with sulphur-yellow pores is figured.

Boletus flavus (With. 1796) Fr. 1835 is regarded as synonymous with Boletus elegans Fr. (non Schum.) Fr. 1836-38 andthe var. pulchella dropped. It appears from the order of thenames on the plates and from an occasional slip in writingelegans that the author would have preferred to use this name.

The figures well represent the range of the species as seenwith us. Great insistence is put upon its occurrence under larch.Fries in 1874 says" semper sub Larice," but it is certain that inthis country though almost always under larch it is not invariably so, though how one is to provide Melin with theII kritische Nachprtifung" he demands is difficult to see.

The plate of Boletus viscidus shows the fungus in the formswell known to British mycologists. It is said to occur underlarch but less frequently than B. flavus. One's impression isthat there is little to choose between the two in that respecthere. A point of interest to those studying mycorrhiza is thatB. viscidus sometimes forms a ring round the bole of the larch.I have known one in Surrey for several years, the fruit-bodiesappearing in wet summers in July.

The publication maintains its high standard of production.J. R.

Mycorrhiza. An account of non-pathogenic infection by fungi invascular plants and Bryophyta. By M. C. RAYNER. NewPhytologist, Reprint No. IS. Wheldon and Wesley, Ltd. 1927.246 pp., 7 pIs., 64 text-figs.Botanists in general will welcome this summary of our know

ledge of mycorrhiza, that strange association of fungus and