200 THE MICHIGAN ACADEMY OF SCIENCE. . 



CONTRIBUTIONS TO THE BOTANY OF MICHIGAN. NO. 8.* 



O. A. PARWELL. 



Ophioglossacecr. 



The form of Botrychiimi simplex that is found in Keweenaw county is 

 the var. subcompositum Lasch. which has a pinnate sterile leaf of two 

 or three pairs of lobes and is very rare. According to Prof. Underwood's 

 revision of the ternate group of this genus, B. matricarisefolium A. Br. 

 becomes B. neglectum Wood.; B. ternatum and the varieties australe and 

 intermedium of the Manual become B. obliquum variety intermedium (D. 

 C. E. ) Underwood and the vars. obliquum and dissectum are elevated to 

 specific rank under these names; the var. rutsefolium becomes B. matri- 

 cariae (Shrank) Spreng. 



There are two forms of B. matri cariaefolium ; the larger form, which is 

 a foot or so high, has large ovate, often ternate, sterile-frond that is 

 twice pinnatifid or twice pinnate, the divisions or segments roundish or 

 oblong and two or three crenately-toothed, or incised and corresponds to 

 Botrychium ramosum {Roth)Aschers: it is the type of the species; the 

 other form, B. neglectum Wood, is smaller; the sterile- frond is oblong, 

 simply pinnate or pinnatifid with 3-5 pairs of roundish-ovate or oblong- 

 ovate nearly equal lobes more or less crenate or toothed and may be 

 designated as Botrychium ramosum {Roth) Aschers var. neglectum 

 {Wood). The species is well represented by the figures of Britton and 

 Brown (Illus. Fl. 1. 3. fig. 4), and of D. C. Eaton (Ferns of N. A. 1., PI. 

 17, f. 10) and the variety by f. 11., of the last-named plate. Both forms 

 are found in Keweenaw county, but the var. is more frequent. B. Lunaria 

 and B. lanceolata are occasionally found in company with B. ramosum 

 and its variety, but are rare. B. Virginianum is the commonest species 

 in Keweenaw county and is found everywhere in rich woods; the var. 

 gracile {Ph.) D. C. E. is a very small form of the species and quite local. 



Polypodiacew. 



Cystopteris Filix-fragilis (L.) {Polypodum FiUx-fragilc Lin. Sp. PI. 

 1091, 1753) is common in moist, rocky situations in Keweenaw county. 

 With the species is a form with a narrower frond and less cut segments ; 

 scarcely bi-pinnate, pinnules narrowly decurrent, oval, obtuse, dentate; 

 it may be known as C. Filix-fragilis {Lin.) var. tenuis {Mx.) {Nephro- 

 dium temie Mx. Fl. Bor. Am., 2, 269, 1803). It is frequent also in woods 

 near Ypsilanti. 



Filix simulata {Davenp.) {Aspidium simulata Davenp. Bot., Gaz., 19, 

 495, 1894), one of the shield ferns, is frequent on Belle Isle in the denser 

 woods at the east end of the island. Its close ally, Filix Thelypteris (l.) 

 {Acrostichum Thelypteris Lin. Sp. PI. 1071, 1753), is also found on Belle 



*The preceding numbers were published in tbe Asa Gray Bulletin. 



*This article has been carried over from "The Fifth Report of the Michigan Academy of Science.' 



