NO. 2229. FOSSIL PLANTS FROM BOLIVIA— BERRY. 119 



Another variable form Pohjstichum denticulatum (Swartz) J. Smith 

 of neotropical South America has reduced forms in the higher Andes, 

 as, for example, the var rigidissimum described by Hooker from 

 Colombia; but this type also seems to be remote from the fossil. 



The resemblances between the fossil form and still existing West 

 Indian species I regard as vaHd evidence of relationship, and while 

 it is probable that the types mentioned from the latter region are 

 represented in the rainforest along the eastern foothills of the present 

 Andes, this resemblance is sufficient, it seems to me, to stamp the 

 fossil as a form that dwelt as either an epiphyte or a rock dwelling 

 form in a region less desiccated and warmer than that inhabited by 

 such modern forms as Polystichum mohrioides (Bory) Presl of south- 

 ern Chile and Patagonia, or Polystichum denticulatum, var rigidissimum 

 Hooker of the high Andes of Colombia. 



This species is represented by a pinnule and a sori beaiing counter- 

 part from Potosi and by the fragment of a pinnule from Corocoro. 



Cotypes.—Q&t. No. 35078 a and h, U.S.N.M. 



Genus LOMARIOPSIS F6e. 



LOMARIOPSIS TERTIARIA EngeUiardt. 



Lomariopsis tertiaria Engelhardt, Sitz. Naturw. Gesell. Isis in Dresden, 1894, 

 Alh. 1, p. 4, pi. 1, fig. 3. 



Description. — This species was described from Potosi by Engel- 

 hardt, who compared it with the existi;jg Lomariopsis sorhifolia 

 Linnaeus which ranges from Guatemala and the Antilles to Brazil. 

 It has not been recognized in the collections studied by me. 



Lomariopsis is a characteristic type of the tropical forests of both 

 hemispheres, with relatively few but highly polymorphic existing 

 species. 



LOMARIOPSIS, (?) species, Engelhardt. 



Lomariopsis, (?) species, Engelhardt, Sitz. Naturw. Gesell. Isis in Dresden, 

 1894, Abh. 1, p. 4, pi. 1, fig. 2. 



Description. — ^A fragment of a larger form, apparently based on 

 the single specimen figured, was described from Potosi by Engel- 

 hardt. It has not been recognized in the other collections, and while 

 the generic reference is probably correct the material is much too 

 restricted for definite characterization. 



Genus ACROSTICHUM Linnaeus. 



ACROSTICHUM LINEARIFOLIUM Engelhardt. 



Acrostichum linearifolium Engelhardt, Sitz. Naturw. Gesell. Isis in Dresden, 

 1894, Abh. 1, p. 4, pi. 1, fig. 4. 



Description. — ^This species, which was based on an inadequate 

 amount of material, has been briefly described by Englehardt, who 

 compared it with the existing Acrosticlium lineare Fee of Brazil. 



