264 Weiss. — A Mycorhiza from the Lower Coal-Measures . 
the greater number of Lycopodiales and Equisetales were probably rooted 
in marshy places in which the conditions would not be very favourable 
to the formation of mycorhizae. In our present state of uncertainty 
as to the nature of the host-plant, of which the root or rhizome only is 
known, it would not be advisable to give it more than a provisional name, 
merely to facilitate reference to the specimen. For such use it would 
be best to employ a non-committal designation, like that of Rhizonium — 
which was invented by Corda (’45) to describe certain roots which he took 
to be those of an Orchidaceous type, and which was afterwards used by 
Williamson (’89) for the roots of an unknown plant. In consideration 
of the peculiar character of the fossil described above, I would suggest that, 
until we know more about the plant to which it belonged, it should be 
referred to as Mycorhizonium. 
List of Works referred to. 
Bernatzky, ’99 : Beitrage zur Kenntniss der endotropen Mycorhizen. Term^szetrajzi Fiizetek, 1899. 
Bertrand, C. E., ’82 : Recherches sur les Tmesipteridees. Archives botaniques du Nord de la 
France, 1882. 
’85 : See Renault and Bertrand. 
Binney, E. W., ’62 : Trans, of the Manchester Geol. Soc. 1862, vol. vi. 
Bruchmann, H., ’85 : Das Prothallium von Lycopodium. Bot. Centralblatt, Bd. xxi, 1885. 
Corda, A. J., ’45 : Beitrage zur Flora der Vorwelt, 1845. 
Goebel, K., ’87 : Ueber Prothallien und Keimpflanzen von Lycopodium inundatum. Bot. Zeit., 1887. 
Groom, P., ’95, I: Contributions to the knowledge of Monocotyledonous Saprophytes. Journal of 
the Linn. Soc., 1895. 
’95, II : On Thismia Aseroe and its Mycorhiza. Annals of Bot., ix, 1895. 
Janse, J. M., ’97 : Les endophytes radicaux de quelques plantes javanaises. Ann. du Jard. de Buit. 
xiv, 1897. 
Lomax, J., ’02 : On the occurrence of nodular concretions (Coal Balls) in the Lower Coal 
Measures. Artn. of Bot., xvi, 1902. 
Magnus, P., '03 : Ein von F. W. Oliver nachgewiesener fossiler parasitischer Pilz. Ber. d. deutsch . 
Bot. Ges., xxi, 1903. 
Magnus Werner, ’00: Studien an der endotropen Mycorhiza von Neottia Nidus avis. Jahrb. 
f. wiss. Bot., 1900. 
Oliver, F. W., ’03 : Notes on fossil Fungi. New Phytologist, vol. ii, 1903. 
Renault, B., ’83 : Cours de Bot. Fossile, vol. iii, 1883. 
Renault, B. and Bertrand, C. E., ’85 : Grilletia sphaerospermi, Chytridiac^e fossile du terrain 
houiller supdrieur. Comptes rendus, tome c, 1885 . 
Schimper, W. P„, and Schenk, A., ’90 : Palaeophytologie. In Zittel’s Handbuch der Palaeontologie, 
1890. 
Seward, A. C., ’98 : Fossil Plants I, 1898 : Cambridge Nat. Science Manuals. 
Shibata, K., ’ 02: Cytologische Studien iiber endotrophe Mycorhizen. Jahrb. f. wiss. Bot., 1902. 
Williamson, W. C., ’81 : Organization of the Fossil Plants of the Coal Measures, Part XI, 1881. 
’89: „ „ „ „ Part XV, 1889. 
