OPHRYOSPORUS 465 



Onuris Phil. Cruciferae (4). i Chili. 



OnycMum Kaulf. Polypodiaceae. 6 trop. and subtrop. 



Onychosepalum Steud. Restionaceae. i S.W. Austr. 



Oocarpon Micheli. Onagraceae (2). i Brazil, Guiana, Cuba. 



Ooclinium DC. = Eupatorium Tourn. p.p. (Comp.). 



Oonopsis Greene (Aplopappus p.p.). Compositae (3). 6 N. Am. 



Oophyte, gametophyte, Pteridophyta ; -sphere, ovum. 



Open (aestivation), 1. not even meeting by their edges. 



Opercularia Gaertn. Rubiaceae (n. 7). 14 Austr. 



Operculina Silva Manso (Ipomoea p.p. BH.}. Convolvulaceae (i). 

 20 trop. Am., As. O. turpethum Silva Manso yields a drug. 



Operculum (Lat.), a lid. 



Ophelia D. Don = Svvertia L. p.p. (Gentian.). 



OpMo- (Gr. pref.), snake. 



Ophiobotrys Gilg. Flacourtiaceae (7). i Cameroons. 



Ophiocaryon. Schomb. Sabiaceae. i Guiana (snakeseed). 



Ophiocaulon Hook. f. (Adenia p.p. EP.}. Passifloraceae. 6 Afr. 



Ophioglossaceae. Filicales Ophioglossales. 3 gen., 50 sp., trop., temp. 

 Small herbs, some trop. sp. epiphytic ; there is a root-stock or rhiz. 

 bearing roots in acropetal succession, and giving off 1. which project 

 above the soil. The 1. bases are usu. fleshy and fit closely together, 

 concealing the stem. The 1. splits into a dorsal and a ventral part, 

 the former being the 'sterile' green blade, the latter the 'fertile' 

 sporangiferous spike, often much branched and containing the 

 sporangia sunk in its tissues. The spores are all of one kind and 

 give rise to subterranean colourless prothalli, living saprophytically. 

 Genera: Ophioglossum (sporangia sessile, in two rows, forming 

 a narrow close spike), Botrychium (sporangia in small crested clusters 

 forming a long loose spike), Helminthostachys (sporangia peltate, 

 borne on sporangiophores which arise from the two sides of the fertile 

 spike). [Lang in Ann. Bot. 1902, p. 23.] 



Ophioglossales. The 3rd order of Filicales (q.v.}. Only fam. Ophio- 

 glossaceae. 



Ophioglossum L. Ophioglossaceae. 30 trop. and temp. 0. vulgatum 

 L., adder's-tongue, in Brit. The 1. are developed very slowly, one 

 appearing above the soil each year. Adv. buds are formed on the 

 roots and thus the pi. multiplies veg. The sporangiferous spike is 

 usu. unbranched, except in O. palmatum L., where "instead of a 

 single spike there are a number arranged in two rows along the sides 

 of the upper part of the petiole and the base of the lamina." (This 

 sp. and O. pendulum L. are epiphytic.) The roots most often arise 

 in relation to the 1., one at the base of each ; commonly unbranched. 



Ophione Schott. Araceae (iv). i Colombia. 



Ophiopogon Ker-Gawl. Liliaceae (vm) (Haemod. BH.}. 5 Japan, 

 China. The mucilaginous tubers of O. japonicus Ker-Gawl. are ed. 



Ophiorrhiza L. Rubiaceae (i. 2). 55 Indomal. 



Ophiorrhiziphyllum Kurz. Acanthaceae (i). i Burma. 



Ophioxylon L. = Rauwolfia Plum. (Apocyn.). 



Ophiurus Gaertn. f. Gramineae (2). 4 palaeotrop. 



Ophryococcus Oerst. Rubiaceae (i. 7). i Nicaragua. 



Ophryosporus Meyen. Compositae (2). 15 trop. and subtrop. Am. 



w. 30 



