90 



miscellaneous than definite as to fixed permanent forms. Though, in 

 the least cut forms the sori are uniserial, in the larger states there is a 

 second incomplete row ; and the more uniformly lobed pinnae, with the 

 venation pinnate in the lobes, are sometimes copiously fertile. As a 

 rule only the interior sori are double. The name is a misnomer,, 

 having been given by Willdenow under the idea that the rootstock 

 was arboreus. — Sloane first gathered it. 



49. A. semihastatum, Kunze. — Rootstock small, fibruus, erect or 

 obliquely decumbent, clothed with small dark scales ; stipites caespitose, 

 slender, 4-10 in. 1. light green, slightly scaly at the base ; rachis similar, 

 winged in the upper part ; fronds bipinnate, lanceolate or oblong-lanceo- 

 late, 6-10 in. 1. 1^-3 in. w. chartaceous, glossy, naked, broadest usually 

 at the base, apex lobate-serrate acuminate ; pinnae spreading, distant, 

 relatively few, 1-2 in. 1. J-f in. w. those of the lower half or two-thirds 

 stipitate, with a few oval segments on one or both sides at the base, 

 lobed beyond this to the outer entire blunt point , veins forked, pinnate 

 in the lobes, branches much curved, sori copious, the longer 2-3 li. 1. 

 and often double, involucres narrow, dark or light brown. — A. cubense, 

 Hook, Sp. Fil. vol. 3 t. 207. A. hymenodes, Mett. ' 



Infrequent on rocky shaded banks from 1,500-2,000 ft. alt. or higher, 

 gathered in St. Mary and Portland, closely resembling some of the 

 forms of arbor earn, but smaller, more slender, much more lax, with 

 fewer, distant pinnae, which in the lower half or more of the frond are 

 uniformly pinnate and broad at the base. 



50. A. monticolum, Jenm. — Stipites tufted \-l ft. 1. slender, chan- 

 nelled, arising from a small fibrous brown-scaly rootstock ; fronds bi- 

 pinnate, ^-1 ft. 1. 3-5 in. w. oblong or ovate-lanceolate, chartaceous, 

 pellucid-dotted, pale, glossy, naked, not narrowed at the base, the acu- 

 minate apex lobed and serrate ; pinnae numerous, spreading at a wide 

 angle, 1J-2J in. 1. ^-1 in. b. the inferior subdistant, stipitate, fully pin- 

 nate at the base, the under side shortly cut away, the upper deep, be- 

 yond that pinnatifid or lobed to the sharply serrated or biserrated, blunt 

 or acute point ; segments ovate ; rachis slender, brown, naked, veins pin- 

 nate in the segments and lobes, branches simple or inferior forked ; sori 

 curved 1-3 li. 1. occupying most of the veins ; the inferior double, in- 

 volucres narrow. — Journ. Bot. 882 p. 326. 



Infrequent on the sides of banks and rocks 4,000-5,000 ft. alt. ; near 

 semihastatum, from which it may be recognised by its larger size, more 

 numerous approximate pinnae which are more pinnatifid and sharply 

 serrate. There is a casual superficial resemblance to Fadyeni and Fran- 

 conis, but the former has laxer pinnae more pinnatifid in the outer part, 

 and the latter is large and compound. In mature fronds the abundant 

 sori nearly conceal the involucres. 



51. A. Fadyeni, Hook. — Rootstock shortly repent, as thick as stout 

 cord ; stipites 4-10 in. 1. slender, subtufted, with a few small deciduous 

 dark brown reticulated scales at the base, fronds bi-or tripinnate, 5-9 in. 1. 

 2J-5 in. w. ovate-lanceolate, the base not narrowed, gradually tapering 

 to the serrate-acuminate apex, dark green, chartaceous, naked, rachis 

 channelled, light green, slender, flat and margined in the upper part 

 and slightly flexuose ; pinnae apart, subdistant, petiolate, opposite or 

 alternate, 1J-2J in. 1. f-lj in. w. pinnate or bipinnate. broadest at 

 the base and thence tapering to the serrate-acuminate point segments 



