OP CEBTACEOUS PLANTS. 275 



In Bayer's original description (Bayer, 1899) he illustrates 

 this fungus with two text-figures which show its very character- 

 istic appearance. He states that it is rare, but readily distin- 

 guished from any of the other Cretaceous fungi. 



Supposed fungus : — 



Genus RHYTISMITES, Meschinelli. 

 [In Sacoardo, Sylloge Fungorum, x, p. 781.] 

 Presumably with the characters of the living genus Rhytisma, 

 but incompletely known. 



^\^viiimitzi \)ttitx;t (Heer), Meschinelli. 



1882. Rhytisma hederce, Heer, Flora foss. Griinlands, p. 20, 



pi. xxiv, fig. 6 a. 

 1893. Rhytismites hederce, Meschinelli, Syll. Fung, foaa., p. 781. 

 1903. Rhytismitcs hederce, Meschinelli, Fungor. foss, omnium 



Iconog., p. 57, pi. xvii, fig. 5. 



Horizon.— Upper Cretaceoiis (Atane Beds). 



Locality. — Greenland. 



TrPE. — Heer's speeimen in University Geological Museum, 

 Copenhagen, on leaf of Hedera primordialis. 



Very many further specimens of the Greenland leaves, not 

 only of Hedera but of other genera, show circular markings 

 similar to those described by Heer as his fungus Rhytisma 

 Jiederce. A number of excellent specimens are in Prof. Nat- 

 horst's collection in Stockholm, and a comparison of these with 

 Heer's original, and with other specimens, suggests strongly 

 that the markings are truly organic but are those of galls, and 

 not fungi. 



The same conclusion is suggested for Phaeidium myrtophylU 

 described by Engelhardt (1892 a, p. 80, pi. ii, figs. 10 a, h). 



Further " genera " which are probably due to salls are : — 



Puccinites cretaceus, Velenovsky, 1889, p. 26, pi. iii, fig. 14, 



which is also the same as Uredinites cretaceus, Velenovsky, 



1889, p. 29, fig. 1, a-h. 

 Pliacidites communis (Feistmantel), Meschinelli, 1902, p. .54. 



= Phacidium commune, Feistmantel, 1874, p. 266. 

 Sclerotites sp. (Knowlton), Meschinelli, 1902, p. 9d.-=Scler- 



otium sp., Knowlton, 1892, p. 23, pi. lix, fig. 4. 



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