78 



lACCOPIEEIS. 



Laocopteris elegans (Presl) from Bayreutli, in the British. Museum 

 Collection (No. 600), shows anastomosiug veins in some ol thfe 

 more perfectly preserved pinnules.' The Laccopteris venation may- 

 he compared with that of Matonia peotinata, hut in the latter fern 

 the anastomes hetween the lateral veins are rather less numerous 

 than in Laeoopteris. The close agreement between Laccopteris 

 and Matonia as regards the form of the frond, the structure of 

 the sori and sporangia, and the venation characters afford sufficient 

 evidence for the iaclusion of the genus in the Matonineae. "We 

 may define the genus Laccopteris as follows : — 



Pronds pedate, in habit like those of Matonia pectinata, B.. Br., 

 with pinnate or pinnatifid piunse ; ultimate segments linear in 

 form, with a well-marked midrib giving off numerous secondary 

 veins which branch dichotomously, and are in places connected by 

 short lateral anastomoses. Sori circular, forming a single row 

 on each side of the midrib ; the sporangia are usually few in 

 number, from five to fourteen, with an ohUque annulus and 

 ietrahedral spores. 



1. Laccopteris polypodioides, Brongniart. 



[Hist. veg. foss. p. 372, pi. Isxxiii. fig. 1, 1828.] 



<P1. XII. and PI. XIII, Figs. 1 and 2 ; Text-flgs. 8, 9, 10, 11b, 



and lie.) 



1828. Fhlehopteris polypodioides, Brongniart, Hist. v%. foss. p. 372, 



pi. Ixxxiii. fig. 1. 

 P. propinqua, ibid. p. 373, pi. cxxxii. fig. 1 ; pi. cxxxiii. fig. 2. 

 Feeopteris polypodioides, Brongniart, Prodrome, p. 57. 



1829. Feeopteris oeespitosa, Phillips, Geol. Yorks. p. 148, pi. viii. fig. 10, 

 F. erenifolia, ibid. p. 148, pi. viii. figs. 11 and 11a. 



F. ligata, ibid. pi. viii. fig. 14. 

 1832. Feeopteris polypodioides, Lindley & Hutton, Foss. Flor. pi. Ix. 



1834. Feeopteris propinqua, ibid. pl. cxix. 



1835. Fhlehopteris contigua, ibid. pl. cxliv. 



1836. Semitelites polypodioides, Goppert, Foss. Farm. p. 336, pl. xv. 



figs. 8 and 9. 

 Folypodites Lindleyi, ibid. p. 342, pl. xxxviii. figs. 6 and 6. 

 Semitelites Brownii, ibid. p. 334, pl. xxxviii. fig. 1. 

 Folypodites crenifolius, ibid. p. 343. 



1 Seward (99), p. 195, fig. 8. 



