106 FLORA OF LOWEE COAL MEASUEES OF MISSOUEI. 



this genus in Hem-y County, on account of the thick, flexuous, fibrous divi- 

 sions, which, although somewhat deeply dissected, have a slightly twisted 

 ajjpearance, the ultimate lobules or lacinese being more or less fasciculate 

 and frequently approaching- parallelism. 



Localities. — Pitcher's coal mine, U. S. Nat. Mus., 5548, 5549; Owen's 

 coal bank, U. S. Nat. Mus., 5547; Hobbs's coal bank, U. S. Nat. Mus., 5550. 



Aphlebia Germari Zeill. 

 PI. XLVL 



1847. ScMzoiHeris Lactuca Presl, Germar, Verst. Steiuk. Wettiu n. Lobejiin, p. 44, 



pi. xviii, figs, la, Ih; pi. xix, figs. 3, 3. 

 1854. Pachyphylhim Lactuva (Presl) Lesqaereux, Bost. Jouru. N. H., vol. vi, p. 422. 

 1858. Pachyphyllum Lactuca (Presl) Lesquereux, la Eogers : Geol. Pennsylvania, p. 863, 



pi. viii, flgs. 4, 5. 

 1869. Bhacophyllum Lactuca (Presl) Schimper, Traite, vol. i, p. 684, pi. xlvi, fig. 1 



(noil xlvii, flgs. 1, 2). 

 1880. Bhacophyllum Lactuca (Presl) Schlmp., Lesquereux, Coal Flora, vol. i, p. 315 



(pars). 

 1889. Ehacophyllum Lactuca (Presl) Scliimp., Lesley, Diet. Foss. Peunsylvania, vol. ii, 



p. 872, text fig. 

 1888. Aphlebia Germari Zeiller, Fl. foss. houill. Com men try, vol. i, p. 289, pi. xxxiv, 



figs. 1,1'. 



The most abundant of the forms of Aphlebia found in the region about 

 Clinton appears to be identical with that illustrated by Germar^ and included 

 by other authors as Scliisopteris or Rhacopliyllum Lactuca Presl. On account, 

 however, of the identity of Presl's species^ with Grutbier's Fucoides crisjms,^ 

 first pointed out by Grutbier, the specific term Lactuca was no longer admis- 

 sible. Accordingly, in 1888, when describing the ApMehice from the Com- 

 mentry Basin, Professor Zeiller* gave to the form published by Oermar as 

 the species Lactuca, but which is now considered distinct from Gutbier's 

 F. crispiis, the name Aphlebia Germari. 



Both Schizopteris Lactuca, including the form illustrated by Germar, and 

 Fucoides crispus were inscribed by Lesquereux^ in the synonymy oi Bhaco- 

 phyllum Lactuca. Thus the Lacoe collection contains, under the last name, 



' Verst. Steinkohl. Wettin u. Lobejun, 1847, p. 44, pi. xviii, figs, la, 16 ; pi. six, figs. 2, 3. 



- Aphlebia Lactuca Presl, in Sternberg : Versuch einer Flora d. Vorwelt, vol. ii, fase. 7-8, 1838, p. 11" 



■'Gutbier, Abdriicke u. Versteiuerungeu, 1835, p. 13, pi. i, figs. 11, 11a. 



■•Fl. foss. houill. Conimentry, vol. i, p. 289, pi. xxxiv, tigs. 1, 1'. 



6 Coal Flora, vol. 1, 1880, p. 315. 



