74 DR. E. A. NEWELL ARBER OX THE [April I9T4, 



Semina incertae sedis. 

 SAMAROSPEEMUM Arber, 1914. 



'Annals of Botany ' vol. xxviii, p. 99. 



Samarospermum moravictjm (Helmh.). (PL XI. fig. 5.) 



1871. Jordania moravica Helmhacker, Sitzungsber. K. Bohm. Gesellsch. 



Wissensch. Prag, p. 81. 

 1875. Jordania moravica E. Geinitz, N. Jabrb. p. 11 & pi. i, figs. 10-11. 

 1892. Samaropsis moravica Zeillev, ' Flore Fossile du Bassin Houiller & 



Pennien de Brive' p. 95 & pi. xv, figs. 9-10. 

 1914. Samarospermum moravicum Arber, 'Annals of Botany ' vol. xxviii, p. 99 



& pi. vi, figs. 19-20. 



This is the first British record of a very rare type of seed, which, 

 for reasons that I have expressed in my recent revision of the- 

 British seed-impressions, 1 1 have transferred to a new genus, 

 Samarospermum. The Kentish specimen appears to be identical 

 with the species first described by Helmhacker (see above), and 

 figured by Geinitz and Zeiller from the Continent, of Avliich only a 

 few examples are known. The generic characters are as follows : 

 Winged, platyspermic seeds, very elongate and narrow, usually 

 broadly rounded at both ends and narrowly elliptical in form. 

 Nucule small, elliptical, situated midway between the apex and 

 the base. Sarcotesta with numerous, fine, parallel, longitudinal 

 striae. 



SAMAROPSIS Gceppert, 1864. 

 'Fossile Flora der Permiscben Formation ' Palaeontographica, vol. xii, p. 177. 



Samaropsis meachemi (Kidst.). (PL XIII, fig. 3.) 



1889. Cardiocarpus meacJiemii Kidston, Trans. Roy. Soc. Edin. vol. xxxv. 



pt. 1, p. 330 & pi. — , figs. 5-7. 

 1914. Samaropsis meachemi Arber, 'Annals of Botany' vol. xxviii, p. 98 



& pi. vi, figs. 16-17. 



This is a rare seed, so far confined to the Middle Coal Measures 

 of Britain, and only recorded from two other localities. It was 

 originally referred to the genus Cardiocarpus by Dr. Kidston ; but 

 I have recently removed it to Samaropsis, on the grounds that 

 the former generic term is best confined to certain platyspermic 

 seeds, which are not winged. The present species has obviously 

 affinity with those seeds that have for many years been referred 

 to Samaropsis, of which S. jiuitans (Dawson) may be regarded 

 as the type. 



PLATYSPERMUM Arber, 1914. 



'Annals of Botany ' vol. xxviii, p. 95. 



Platyspermum RUGOSuiki Arber. (PL XII, fig. 2.) 



1914. Plati/spermum rugosum Arber, 'Annals of Botany ' vol. xxviii p. 96 & 

 pi. vi, fig. 13. 



The Mattice Hill seed, shown in PL XII, fig. 2, which I have 



] Arber (1914) p. 90. 



