Flora of North America species comparison

often whitish pruinose, slender, to 6 mm diam., acrid-tasting;

scales weakly bicolored, lanceolate, contorted distally, bases and margins light brown, sometimes with dark central stripe, margins often coarsely dentate.

long- to short-creeping, branched or not, bearing scales and few to numerous roots, usually dictyostelic.

to 30 cm.

monomorphic to dimorphic, circinate in bud.

slender, to 1.5 mm diam.

usually articulate at base [rarely nonarticulate, as in Loxogramme], lacking scales or sometimes scaly, with usually 3 vascular bundles.

oblong to rarely deltate, pinnatifid, usually widest near middle, occasionally at or near base, to 4 cm wide, somewhat leathery;

rachis sparsely scaly to glabrescent abaxially, glabrous adaxially;

scales lanceolate-ovate, usually more than 6 cells wide.

simple to often pinnatifid, pinnatisect, or pinnate, infrequently more divided;

rachis grooved or not adaxially.

oblong, less than 12 mm wide;

margins entire to crenulate;

apex rounded to broadly acute;

midrib glabrous adaxially.

free (and simple to several times forked) to often anastomosing in complex systems, areoles with or without included veinlets.

midway between margin and midrib to nearly marginal, less than 3 mm diam., circular when immature.

borne abaxially on veins, round to oblong, occasionally elongate, rarely marginal, rarely covering surface;

paraphyses present or absent;

sporangia with stalk of 2 or 3 rows of cells;

indusia absent.

more than 58 µm, rugose to verrucose, surface projections less than 3 µm tall.

usually transparent or yellowish (rarely greenish), all 1 kind, bilateral, monolete [rarely trilete, as in some Loxogramme], surface most often smooth, tuberculate, verrucose, or granulate, occasionally spiny, 64 per sporangium (spores globose and 32 per sporangium in apogamous spp.).

green, aboveground, cordate or elliptic, glabrous or sometimes glandular;

archegonia and antheridia borne on lower surface, antheridia 3-celled.

free.

present, usually less than 40 per sorus, heads covered with glandular hairs.

on blade absent, or petiole, rachis, costae, and sometimes blade tissue usually bearing hairs (these often septate and with reddish crosswalls) and/or scales.

= 74.