226 ASPLENIUM, § ATHYRIUM. 



ing oblong-lanceolate petiolate, secondary shortly petiolate 

 or sessile 1-2 inches long from a rather broad base oblong 

 or ovato-oblong subobtuse deeply pinnatifid nearly to the 

 rachis (especially in the lower half) or again pinnate, seg- 

 ments or i)innules oval-oblong 1^-2 lines long very obtuse 

 more or less lobed (mostly so on the superior margin), lobes 

 short rounded entire or more or less dentato-serrated, serra- 

 tures obtuse or acute or even spinulose, veins pinnated 

 veinlets simple or forked oblique, sori rather small straight 

 or curved sometimes diplazioid, involucres pale brown at 

 length tumid suberose at the margin. — Var. a; segments or 

 pinnules obtuse or obtusely serrated. Fries, Summa Veg. p. 

 ^53. Kze. Bot. Zelt. x'ni. p. 277' LedeL Fl. Ross. iv. p. 518. 

 Aihy rmm, Rupp. Moore, Ind. Fil. p. 180. Aspidium, /S»o/»- 

 mer/. Hartm. Cysto'^i&v'is, Fries, Mant.'m. p. \^o. Hook. 

 Sp. Fil. i. p. 200. Asplen. and Aspid. Sibiricum, Turcz. 

 Kze. Anal. Pterid. p. 25. L 15. — Var, /3; segments and pin- 

 nules spinuloso-serrate. Cystopteris spinulosa, Maxim. Fl. 

 Amur p. 340. Athyrium Hookerianum, Moore, MS. in Herb. 

 Hook. 



Ilah. Var. a. Sweden, Norway, and Lapland, apparently common, Fries, Som- 

 niprfelt, Blt/th, and others (in Herb. Nosfr.). Dalmria, Turczavinoff. Japan, 

 Dr. Babimjton, n. 109.— Var. j8. Sikkim-Ilimalaya, elev. 10-12,000 feet, 7/ooA-. 

 fl. et Thomson. Manchuria, JVilford, n. 1163. Amur, Maximowicz (Cystopteris 

 spinulosa) : it is said also to be found in Siberia. — This very distinct species I 

 briefly noticed in the first volume of the present work, p. 200, under the name 

 of Cystopteris crenata, Fr., when I possessed only imperfect specimens, and when 

 the species was supposed to be peculiar to northern Europe; and I then expressed 

 my belief that it would prove to be an Athyrium of Presl. I have since received 

 specimens showing that it inhabits northern Asia, as well as northern Europe. 

 There are two forms, however, with and without spinulose teeth to the pinnules : 

 some of these pinnules have a great resemblance to those of Aspl. Fili.v-f(Emina, 

 but the outline of the frond is widely different in the two, and the sori are much 

 smaller. 



231. A. (Athyrium) decurtatum,L,]<.. ; " trunk erect clothed 

 with pale membranaceous ovate scales, stipes stramineous at 

 length naked, frond 2-3 feet long meml)ranaceous pubescent 

 on both sides especially at the margin oblong-lanceolate pin- 

 nate, pinnoe 4-5 inches long 6-8 lines wide subarticulated 

 shortly petiolate lanceolate-acuminate deeply pinnato-partite, 

 lacinisc from a slightly broader base oblong or elongato- 

 oblong rather obtuse entire or slightly denticulate, lower 

 ones abbreviated, secondary vein pinnated with undivided 

 branches, sori short oblong or oval 6-10 in two series at the 

 costule of the segments the superior basal ones of the supe- 



