15 



noted, as for example the well known restriction of Camptosorus 

 rhizophylliis to the vicinity of limestone cliffs. 



When the effects of the geological formation on the distribution 

 of plants and the relations between them are better known, it will 

 certainly facilitate the efforts of the collector by directing him to 

 localities where the geological formation is similar to that of known 

 districts, and where he may reasonably infer that the flora will be 

 also in keeping; provided, of course, that there is not too great a 

 diversity in climate and physiographic conditions. 



Within a radius of perhaps 50 miles it would be reasonable to 

 expect that similar geological conditions would afford similar floras. 

 Port Richmond, S. I. Arthur Hollick. 



[As regards Camptosorus we may state that, according to our own 

 observations, the plant is not exclusively calcicolous; it is not rare in 

 the Hudson River Valley on the slates and shales of the Hudson 

 River Group. And we may say the same of Asplenium Ruta-miiraria ; 

 which also is usually described as one of the lime-rock ferns. — Eds.] 



Setaria glauca, Beauv. and S. viridis, Beauv. — Last Summer I 

 collected indiscriminately, and from many localities, specimens of 

 Setaria. During this Winter I analyzed about 15 of theni under the 

 microscope and found only one specimen of the S. viridis I— Is the 

 S. glauca so much the commoner of the two, or was this only 

 accidental? 



A. H. 

 7. Bryological Notes, by C. F. Austin. 



Sphagnum macrophylum, Bernhardi Var, Floridanum, Aust. 



— Differs from the typical form, as described and figured in Sulliv. 

 Icon, p- I. t. I., and as represented in various exsiccati, in its lurid 

 green, or often albescent color ; but chiefly in the areolae of the 

 leaves being about twice as long and furnished with 40-70 extremely 

 minute pores^ intwo roivs* — A remarkable var. Hab. .Florida. 



Sphagnum cuspidatum, Ehrt., F^r. serratum, Aust. — Sphag- 

 num serratunty Aust., this Journal, vol. vi., p. 245 ; also Muse. Ap- 

 palach. Suppl n. 453. — Specimens collected by Capt. Smith about 

 Lake Harris, Fla., last spring, show pretty conclusively that this is 

 only a remarkable form of Sp/i. cuspidatum ; only the leaves on the 

 uppermost branches being decidedly serrate. 



Bruchia Sullivanti, Ausx., Var. microlheca. — Form and texture 

 of the leaves normal ; but the plants are much smaller than usual. 

 The capsule is about half the usual size and of a fine light brown 

 color, with a remarkably short collum usually passing insensibly into 

 the pedicel, which is geniculate when moist and straight when dry. 

 Sporangium round-oval, twice the length of the collum. Spores 

 among the smallest of the genus, or about 1-1,000 of an inch in di- 

 ameter, not papillose but very fuinutely granulose. Inflorescence for the 

 most part antoicous, Hampden Co. Va. Apr., 1878. J. D- S, 



DONNELLIA, nov. gen. 



Oonnellii Fioridana, Aust., Fabronia Donnellii, Aust., /// Bot. 



Gazette^ vol. ii., p. iii. — ** Folis oblongo-lanceolatis strictiusculis 



nonnunquam submarginatis obsolete scrrulatis fere ecostatis, rellulis 



perangustis, basilaribus majoribus subquadratis inflatis ; capsulaovali 



