88 
A British Fossil Selaginella. 
kind of reticulate sculpturing as is faintly shown in Fig. 6. Amongst 
other recent species of similar habit are 5. borealis Spring, from 
East Siberia, the Eastern Himalayas, and other regions ; 5. involvens 
Spring, a Far Eastern type ; and S. cuspidata Link from Mexico, 
Cuba, and Central America. 
The spores of several recent species are almost identical both 
in size and surface-features with those of the fossil: the microspores 
of S. serpens and 5. canaliculata are respectively 0.03 and 0.04 mm. 
in diameter; the reticulate spores of S. Martensii are 0.03 mm. 
(microspores) and 0.35-0.40 mm. (megaspores) in diameter. In some 
recent species the spores are larger: in 5. emiliana the microspores 
have a diameter of 0.07 mm., while the megaspores exceed 1 mm. 
In the Upper Carboniferous species Selaginellites primcevus 
(Gold.) and 5. elongatus (Gold.) 1 the megaspores, the only spores so 
far discovered, are respectively 0.4-0.5 mm. and 0.45 mm. in diameter. 
In S. Suessii Zeill. the megaspores are 0.50-0.65 mm. in diameter 
and are provided with an equatorial flange like that on the spores 
of Selaginella caulescens, while the microspores have a diameter of 
0.04-0.06 mm. In this French species from the Coal-measures 
(Stephanien) of Blanzy there are 16-24 megaspores in the mega¬ 
sporangia. 3 In Selaginellites Daivsoni the number has not been 
determined. 
Several Cretaceous and Jurassic species of Lycopodites have 
been described from British and foreign localities, but without 
information as to the nature of the spores it is impossible to assign 
them to a definite position in the Lycopodiales. 
1 Halle (’07), p. 9. 
2 Zeiller (’06), p. 141, Pis. xxxix-xli. 
REFERENCES. 
Baker, J. T. (’87). “ Handbook of the Fern Allies.” London. 
Bennie, J., & R. Kidston. (’88). “On the occurrence of Spores in the 
Carboniferous Formation of Scotland.” Proc. R. Phys. 
Soc. Edinburgh, Vol. IX, 1885-88. 
Fitting, H. (’00). “ Bau und Entwickelungsgeschichte der Makrosporen von 
Isoetcs und Selaginella und ihre Bedeutung fiir die Kenntniss 
des Wachsthums pflanzlicher Zellmembranen.” Bot. Zeit., 
Bd. LVIII, p. 107. 
Halle, T. G. (’07). “ Einige Krautartige Lycopodiaceen Palaozoischen und 
Mesozoischen Alters.” Archiv. Bot. (Stockholm), Bd. VIII, 
No. 5. 
Heinsen, E. (’94). “Die Makrosporen und das Weibliche Prothallium von 
Selaginella." Flora, Bd. LXXVIII, p. 466. 
Hieronymus, G. (’02). In “ Die Natiirlichen Pflanzenfamilien.” (Engler and 
Prantl). Teil. I, Abt. iv., p. 621. Leipzig. 
Kidston, R. See Bennie and Kidston. 
Lyon, F. M. (’01). “ A Study of the Sporangia and Gametophytes of Selaginella 
apus and 6'. rupestris." Bot. Gaz., Vol. XXXII, p. 124. 
