356 



FILICALES 



founded by Presl\ may 



[CH. 

 be de- 



Laccopteris. This genus, 

 scribed as follows: — • 



Frond pedate, in habit resembling Matonia pectinata, with pinnate or 

 pinnatifid pinnae ; ultimate segments linear, provided with a well-marked 

 midrib giving off' numerous dichotomously branched secondary veins which 

 are in places connected by lateral anastomoses. Sori circular, forming a 

 single row on each side of the midrib (fig. 278, B) ; sporangia 5 — 15 in each 

 sorus, with an oblique annulus and tetrahedral spores. The presence of 

 an indusium is not certainly established. 



Fio. 263. GleUhenites hantonensis Wank. (Restoration, after Gardner and 

 Ettingshausen.) 



Schenk^, who described several specimens of Laccopteris 

 from Rhaetic rocks of Germany, compared the genus with 

 Gleichenia but he also recognised the close resemblance to 



' Presl, in Sternberg (38) A. p. 115. 



= Schenk (67) A. 



