Johnson— 7%e Occurrence of Archceopteris Tsche^^maJci, Stur. 141 



The accompanying table shows the distribution of the fertile species of 

 Archceopteris as recorded : — 



Distribution of Fertile Species of Archjeopteris. 



' Stei'ile state only known. 



- D. White regards Arehaopteris archeti/piis, Schmalh., and A. fissilis, Schmalh. as identical with 

 the two American species, A. obtusa, Lesqx., sp., and A. sphenophyllifolia. This view, if upheld, 

 remoyes the anomaly of the geographical distribution of Schmalhausen's two species, and indicates 

 their occurrence in N. America. 



