46 American Midland Naturalist Monograph No. 7 



woods, rare; n. 111., known from Boone, Cook, Kan- 

 kakee, Lake, La Salle, Ogle, and Winnebago counties. 



Crested Wood Fern D. cristata (L.) A.Gray 



6. Leaves 2-3 pinnate, the pinnae spinulose-toothed. 



9. Pinnae at right angles to the rachis; inner pinnules of the 

 basal row equalling or shorter than the next outer ones; 

 leaves (at least the rachis) usually with a few small 

 scattered stipitate glands; indusium with marginal 

 glands; moist woods, locally throughout 111., except the 



eastern and central counties. Common Wood Fern 



D. intermedia (Muhl.) A.Gray 



9. Pinnae oblique to the rachis; inner pinnules of the basal 

 row longer than the next outer ones; leaves and indusia 

 not glandular; woods, local; n. 111.; also Pope and Union 



counties. Spinulose Wood Fern 



D. spinuhsa (O.F.Muell.) Watt 



8. Polypodium L. — Polypody 

 1. Leaves glabrous on both sides; rocky ledges, locally abundant. [P. 



vulgare of auth., non L.] P. virginianum L. 



1. Leaves copiously scaly-scurfy beneath; on rocks, rarely on trees; 



s. Ill P. polypodioides (L.) Watt 



9. Camptosorus Link 

 C. rhizophyllus (L.) Link. Walking Fern. Moist rocky ledges, not 

 rare. 



10. Asplenium L. — Spleenwort 

 1. Stipe green at least above; rachis green throughout, flat. 



2. Leaves pinnatifid, or pinnate below, lanceolate, tapering to a 

 long narrow tip, the segments obtuse, crenate; sandstone 

 clifTs, rare, s. 111. Pinnatifid Spleenwort ....A. pinnatifidum Nutt. 



2. Leaves 2- to 3-pinnate, rhombic in outline, the segments cuneate, 



finely toothed at the apex; usually on calcareous cliffs; s. 111.: 

 without definite locality, Brcndel. Rue Spleenwort [A. crypto- 



lepis Fern.] A. ruta-rniiraria L. 



1 . Stipe dark ; rachis black or brown, or green on upper part, terete. 



3. Rachis brown on lower half, green above. 



4. Blades with 3-6 pairs of doubly serrate to subentire not lobed 

 pinnae; stipes dark brown or black, not glossy; sandstone 

 clifTs, very rare; "s. 111.", F. S. Earle about 1890. Kentucky 

 Spleenwort A. kentuckiense T.N. McCoy 



4. Blades with 8-18 pairs of lobed (or with pinnules), sharply 

 toothed pinnae; stipes chestnut-brown, glossy; sandstone 

 cliflfs, s. 111.; known from Jackson, Randolph, and Union 



counties. Cliff Spleenwort A. bradleyi D.C.Eaton 



3. Rachis black or brown throughout. 



