44. NEPHRODIUM, LASTREA. 273 



76. N. (Last.) marginale, Mich. ; st. tufted, 6-12 in. 1., clothed principally at 

 the base with large lanceolate concolorous scales ; fr. 18-24 in. 1., 6-8 in. br., 

 oblong-lanceolate, bipinnate ; pinnae 3-4 in. 1., 1-1^ in. br. ; pinnl. ovate-oblong, 

 blunt, nearly entire ; rachis and both sides nearly naked ; texture herbaceous ; 

 lower veinlets of the pinnl. pinnate ; sori marginal. Ilk. Sp. 4. p. 122. 



Hab. Canada and United States. About midway between the typical form 

 mas and cristatum in general habit. 



77. N. (Last.) lacerum, Baker ; st. 4-8 in. 1., densely clothed below with large 

 ovate-lanceolate scales ; fr. 12-18 in. 1., 6-10 in. br., ovate-deltoid ; pinnae 4-5 

 in. 1., 1^-2 in. br., lanceolate ; upper pinnl. confluent, lowest free, lanceolate, 

 acute, subfalcate, nearly entire, but the lower ones auricled on both sides of the 

 base ; texture subcoriaceous ; rachises rather scaly ; both sides naked ; sori 

 confined to the upper third of the frond, occupying nearly the whole of the con- 

 tracted pinnl. ; invol. \ lin. br. Polyp. Thunb. Lastrea, Eaton. 



Hab. Japan and Tsus-Sima. Very near some of the Indian forms of Filix-mas, but 

 admitted as distinct by Eaton and Mettenius. 



78. N. (Last.) erythrosorum, Hk. ; st. tufted, 6-9 in. 1., more or less densely 

 clothed with long lanceolate and linear scales ; fr. 12-18 in. 1., 8-12 in. br., 

 ovate-lanceolate ; pinnae lanceolate, the lowest the largest, 5-6 in. 1., l in. br., 

 cut quite down to the rachis below into oblong-bluntish pinnl. 2-3 in. br., the 

 edge slightly, sometimes spinosely, toothed ; texture firm but herbaceous ; both 

 sides naked" ; rachis slightly scaly ; sori in rows of 6-9 to a pinnl. near the 

 midrib ; invol. $ lin. br., flat, bright-red when young. Hk. Sp. 4. p. 120. t. 253. 



Hab. Japan and China. Intermediate in appearance between Aspid. varium and 

 N. Filix-mas. 



79. N. (Last.) Floridwium, Hk. ; st. 6 in. or more 1., with a few ovate con- 

 colorous scales ; fr. H-2 ft. 1., 6-8 in. br., oblong-lanceolate ; fertile pinnce 

 confined to the upper half, close, lanceolate, 3-4 in. 1., 1-1 in. br., cut down to 

 a narrowly-winged rachis into oblong, slightly crenated, blunt pinnl., with their 

 own breadth between them and two rows of sori reaching from the midrib 

 nearly to the edge ; barren pinnce broader, the lower ones rather reduced and 

 subdeltoid, all not so deeply cut and the pinnl. close ; texture herbaceous, both 

 sides naked. Hk. Fil. Ex. t. 99. 



Hab. Louisiana and Florida. Perhaps a form of N. cristatum, with which it agrees 

 in its barren pinnse, diffei'ing in its dimorphous fertile ones. 



80. N. (Last.) cristatum, Mich. ; st. tufted, 6 in. or more 1., sparingly clothed 

 with ovate concolorous scales ; fr. 12-18 in. 1., 3-5 in. br., narowly oblong- 

 lanceolate ; lower pinnce deltoid, 2 in. 1., 1 in. or more br., the lowest pair about 

 equal to the next, cut down nearly, or quite, to the base below into broad, 

 blunt, oblong, slightly pinnatifid pinnl.; teeth not aristate ; texture herbaceous ; 

 stramineous rachis and both sides nearly naked ; invol. naked. Hk. Sp. 4. 

 p. 121. ]3, N. uliginosum (Newm. sub Lastrea} ; fr. broader ; pinnl. more acute 

 and more deeply cut, teeth mucronate. Brit. F. t. 17. A. spinuloso-cristatum, 

 Lasch. 



Hab. Scandinavia to N. Italy and Greece ; Hudson's Bay territory, Canada, United 

 States. Our /3 is a connecting link between cristatum and spinulosum, the barren fronds 

 resembling most the former, and the fertile ones the latter. 



81. N. (Last.) Borneense, Hk. ; rhizome stout, wide-creeping, densely fibril- 

 lose ; st. 6 in. 1., firm, erect, brown, naked; fr. 12-18 in. 1., 4-6 in. br., 

 lanceolate ; pinnce 2-3 in. 1., f to 1 in. br., cut down to a broadly- winged rachis 

 into linear-oblong deeply pinnatifid lobes ; texture subcoriaceous ; rachis and veins 



2 M 



