126 21. ADIANIUM, EUADIANTUM. 



6-9 in. 1., 1-1^ in br. ; pinnl. |-| in. 1., in. deep, dimidiate, broadest on the 

 side nearest the stem, the upper and outer margin lobed, sometimes one-third 

 down, the lowest on short slender stalks ; texture pellucido-herbaceous ; rachises 

 and surface naked; sori roundish or transversely oblong, 1-2 lin. br. Hk. 

 Sp. 2. p. 55. 



Hab. North Hindostan, ascending to 7-9,000 ft., Japan, Mantchuria, Unalaschka, 

 and Canada southward to Virginia and California. In this the main forks curve 

 gracefully, and have from 4 to 6 branches, each springing from the upper side, the central 

 ones of which are most developed. 



55. A. tetragonum, Schrad.' ; st. 6-12 in. 1., polished, blackish, glabrous ; fr. 

 dichotomous, with main divisions again once or twice forked ; pinnoe 8-12 in. 1., 

 2-3 in. br. ; pinnl. 1 j-1^ in. 1., f~|- in. deep, not truly dimidiate, but only the 

 lower two-thirds of the under half cut away, the upper margin rounded and 

 broadly lobed, with the lobes finely toothed and point often lengthened out ; 

 texture papyraceo-herbaceous ; rachis and surfaces naked ; sori linear or trans- 

 versely oblong, placed round the upper edge, and sometimes also the outer third 

 of the lower one. Ilk. Sp. 2. p. 28. A. curvatum, Raulf. Hk. Sp. 2. p. 29. 

 t. 84. C. 



Hab. Brazil. Easily recognizable from the preceding by the difference in the branch- 

 ing and by the pinnules not being quite unilateral. A. Lindscea, Cav., A. humile, 

 Kunze, and A. angmtatum, Kaulf., are little-known pedate plants. 



56. A. patens, Willd. ; st. 6-9 in. 1., erect, dark chesnut-brown, polished, but 

 slightly tomentose ; fr. dichqtomously branched, and the branches once or twice 

 branched again ; central pinnae 6-9 in. 1., 1^ in. br. ; pinnl. ^-f in. 1., j in. deep, 

 dimidiate, the two sides nearly parallel, the upper one broadly and bluntly 

 lobed, and the outer blunt and lobed also ; texture papyraceo-herbaceous ; rachises 

 slightly tomentose, under surface slightly hairy ; sori placed round the upper 

 and outer edge, obversely reniform, and placed in distinct small rounded hollows. 

 Hk. Sp. 2. p. 29. t. 87. A. 



Hab. Mexico, southward to Ecuador and Galapagos Islands. The large horny sub- 

 orbicular involucres, sometimes ^ in. br. and nearly as deep, distinguish this readily from 

 the other plants of the group. 



57. A. hispidulum, Swartz; st. 6-15 in. 1., strong, erect, polished, dark 

 chesnut-brown, scabrous ; fr. dichotomous, with the main divisions flabellately 

 branched ; central pinnoe 6-9 in. 1., ^-1 in. br. ; pinnl. f -f in. 1., 2-4 lin. br., 

 dimidiate, subrhomboidal, rather broader on the side nearest the stem, the outer 

 edge bluntly rounded or oblique, upper and outer margin finely toothed, lower 

 ones slightly stalked ; texture subcoriaceous ; rachises and both surfaces hispid ; 

 sori roundish, numerous, contiguous round the upper and outer edge. HJc. Sp. 2. 

 p. 31. A. pubescens, Schk. 



Hab. Asia Neilgherries and Ceylon eastward to Fiji, southward to N. S. Wales and 

 New Zealand ; Africa Bourbon, Mauritius, Zambesi Land, banks of the Niger. Easily 

 distinguished from the other species by its densely pubescent segments and rachises. 



58. A. flabelhdatum, Linn. ; st. erect, strong, polished, blackish, naked ; fr. 

 dichotomously branched and the branches once or twice branched again ; central 

 pinnae 4-8 in. 1., f in. br. ; pinnl. about 4 lin. br., 3 lin. deep, dimidiate, the 

 lower edge nearly straight, the upper rounded, the outer blunt, both entire or 

 slightly toothed ; texture coriaceous, rachises and surfaces naked ; sori in several 

 transversely oblong patches round the upper and outer edge.i Hk. Sp. 2. p. 30. 

 A. amcenum, Hk. & Gr. t. 103. 



Hab. Hindostan from the Himalayas to Ceylon, Japan, S. China, Malayan Peninsula 

 and Islands. The pinnules are larger and broader than those of A . hispidulum, and only 

 the rachis is finely pubescent. 



