21. ADIAVTUM, ^ EtTADIANTUM. 115 



n.ib. Ramparts of Canton, IJance, 7542. — This much resembles A. tremulum ; but the 

 petioles are shorter, and the lower pinnae opposite and round, not dimidiate. 



5. A. caudatum, Linn. ; st. 2-4 in. 1., tufted, wiry, spreading, dark chesnut- 

 brown, tomentose ; fr. Ct-V2 in. 1., simply pinnate, often elongated and rooting at 

 the extremity ; pinnce ^-^ in. 1., J in. deej), dimidiate, nearly sessile, the lower 

 line straight and liorizontal, the upper rounded, more or less cut, often deeply 

 and repeatedly, the point usually blunt, the lower ones slightly stalked ; texture 

 coriaceous, the veins prominent, the rachis and both surfaces of the frond villose ; 

 sori roundish or transversely oblong on the edge of the lol)es. — Hk. >Sj). 2. p. 13. 

 Ex. Fl. t. 104. — /3, A. rhizophorum, Swartz ; pinnce and rachis nearly or quite 

 glabrous. — A. Edgeworthii, Ilk. Sp. 2. p. 14. t. 81. B. 



Hab. Arabia Felix, Himalayas (3,000 ft.), and Hongkong, southward to Ceylon and 

 Java, Cape Colony, Mauritius, Zambesi Land, Angola, banks of the Niger, and Cape 

 Verde Islands. — A. soholifcvum, VVallich (Uk. Sp. v. 2. t. 74. A.), appears to be a form 

 of this with winged petioles and stipes. A similiar foim of A. lunulatum, which is A. 

 ptenpus, E. Br. MSS., has been gathered by Drs. Kirk and Welwitsch in South Afiica. 



G. A. calcareum, Gard. ; st. slender, filiform, 2-3 in. 1., polished, blackish, 

 naked ; /)■. 4-G in. 1., or prolonged and rooting at the extremity ; pinnce j-| 

 in. br., j in. deep, varying in shape from a quarter to nearly half a circle, lobed 

 from the circumference towards the centre 2 or 3 times half the way down, and 

 the main lobes again cleft less deeply ; texture thinly herbaceous ; rachis and 

 both surfaces naked ; sori roundish or transversely oblon?, placed in small 

 depressions at the apex of the lobes. — Hk. Sp. 2. p, 15. Ic. PL t. 4G7. 



Hab. Province of Goyaz, Brazil; gathei'ed by INIr. Gardner. — A more tender plant 

 than A. caudatum, which is not known in America, but not clearly distinct. 



*** Polysorus group. — Fronds once or more pinnate, the fruit in numerous 

 roundish or oblong or transversely reniform marginal patches. Sp. 7-31. 



f Ultimate segments not dimidiate, hut having two more or less distinctly/ opjyosite 

 rows of sori. Sp. 7-12. 



7. A. KauJfnssii, Kunze; st. 4-9 in. 1., wiry, erect, naked, polished, blackish ; 

 fr. G-12 in. 1., 3-4 in. br., with a large terminal lobe and 1 to 12 alternate pinnce 

 on each side, the lowest 2-3 in. 1., ^-1 in. br., cordate and auricled broadly at 

 the base above, roundly cut away on the lower side, slightly stalked, and 

 those of the barren frond slightly toothed ; texture coriaceous ; rachis pubescent ; 

 sori in interrupted marginal lines. — Hk. Sp. 2. p. 7. Hk. Sf Gr. t. 190. 



Hab. Mexico and West Indies, southward to Brazil and Peru. — This is A. ckntlcu- 

 latum, Swartz, according to an original specimen in the British Museum. 



8. A. obliquwn, Willd ; st. 3-G in. 1., erect, wiry, polished, blackish, slightly 

 pubescent ; fr. 6-12 in. 1., 2-4 in. br., with a terminal lobe and 3 to 12 pairs of 

 alternate />m?«cE, the lowest 1-2 in. 1., |-| in. br., costate nearly to the apex, the 

 upper half the largest, rounded at the base, tlie lower half obliquely truncate at 

 the base, shortly stalked, those of the barren frond slightly toothed ; texture 

 coriaceous ; rachis pubescent ; sori in numerous interrupted marginal patches 

 1-2 lin. hx.-^Hk. Sp. 2. p. 8. t. 79. A. 



Hab. West Indian Islands, Columbia, and Guiana. — Very doubtfully distinct from 

 A. Kaulfussli. The characters relied upon are the thicker texture of this, its more con- 

 tinuous sori, and the absence of a glaucous tinge on the under side of the le;tve-i. la 

 I'lora Brasiliensis I have joined them as two varieties oi A. platyphyllum, Swartz. 



