42 



pit. It reappears at the surface nearly two miles distant, on the 

 level flat a short distance from the river. Here it is called the 

 Blue Spring.* 



As nearly as can be ascertained without a special visit to the 

 place, the formation in which the sink-hole occurs is the Bangor 

 "rotten" or "Mountain" limestone. [See note III in thesis by 

 the writer, previously mentioned. ) This limestone includes a few- 

 beds of shale, several occurring near the top, so that the presence 

 of the clayey habitat is easily explained, t 



SEVERAL SUPPOSED STATIONS. 



(a) Chiapas, Mexico. In his Ferns of North America, J Prof. 

 Eaton cites the Hart's-tongue as occurring at "Chiapas, Mexico." 

 The specimens (Eaton Herbarium) upon which this determination 

 was apparently based, were collected in ' ' cool regions ; crevices of 

 rocks in the bottoms of caves (296-307)" at Chiapas, Mexico, by 

 Ghiesbreght. || They are not to be referred to Phyllitis Scolopen- 

 dnum, but rather to Phyllitis Linden! (Hook. ) a species clearly 

 distinct from the former. The habitats of Ghiesbreght' s and Lin- 

 den's specimens are rather diverse, but not more so than those of 

 many species of Polypodium of the same region. 



(b) Sitka, Alaska. Milde^j records the fern from " Insula Sit- 

 cha," and adds "(herb. caes. Petrop. horti bot. )," indicating that 

 the specimens are preserved in the St. Petersburg Herbarium. The 



*The greater portion of the foregoing has been kindly contributed by Mr. 

 nd Mrs. Joseph H. Lodge, of South Pittsburg, who at the time (1898) of their 

 ivestigation forwarded several living plants to me. I have described the sta- 

 on in some detail, since an article has recently appeared (James II. Ferriss, 

 Bull. 7: 98. 1899) indicating doubt as to the existence of the fern in that 

 tation at present. It is evident that Mr. Kerriss missed the sink-hole in 

 question, which is not remarkable, since there are several in the near vicinity. 

 tSafford and Killebrew, Elem. Geol. Teiin. p. 153. 

 tD. C. Eaton, Ferns N. Am. \: 247. 1879. 



I See Cat. Coll. Ferns So. Mexico, mainly at Chiapas, by A. Ghiesbreght, 

 1864-70. This pamphlet (pp. 10), kindly loaned me by Prof. Underwood, is 

 evidently a reprint. The determination of the ferns was accomplished by 

 Hall, probably under Prof. Eaton's supervision. The two sheets have been 

 kindly loaned me by Prof. A. W. Evans, of Yale University. 



\ScolopendriumLindeni Hook., well figured and described (Hooker, Ic. 

 PI. II. \:pl. 488. 1842) from specimens collected "on old oaks, Chamulars, Prov. 

 Chiapas, Mexico," by Linden, \\. 1543. 



, Fil. Europ. et Atlant. 90. 1867. 



