SCHIZiEA. 



[ 566 J 



SCHIZOCHLAMYS. 



Sch. pennata, Hook, and Taylor, occurs here 

 Fig. 633. Fig. 634. Pig. 635. 



Schistostega osmundacea. 



Fig. 633. A plant or fruit. Magnified 10 diameters. 



Fig. 634. Open capsule with operculum. Magnified 50 

 diameters. 



Fig. 635. Young capsule opened, showing the colu- 

 mella. Magnified 50 diameters. 



and there in Great Britain. The name was 

 derived from what appears to have been an 

 erroneous observation of Hedwig, who de- 

 scribed radiating fissures in the operculum, 

 which do not exist in Uving specimens. The 

 germinating confervoid prothallium of this 

 moss was described by Bridel as an alga, 

 under the name of Cafoptridium smarag- 

 dinum; Agardh described it as a Protococcus 

 {smaragdinis), and it was long supposed to 

 be phosphorescent. This appears to be an 

 error; Schistostega grows on the roofs of 

 sandy caves and similar places, and the 

 luminous appearance seems to arise from the 

 condensation and reflexion of the little day- 

 light admitted by the pellucid convex cellules 

 of the prothallium. 



SCHIZ^A, Smith.~A genus of Schi- 

 zseous Ferns of curious and elegant structure. 

 Exotic (figs. 636, 637). 



SCHIZvEEiE. — A tribe of Polypodiaceous 

 Fems, with sporanges in the form of a top, 

 and crowned by a radiated cap-like *annulus,' 

 which hardens at matiu-ity, sphtting the case. 



Genera. 



I. Aneimia. Sporangia twin, sessile in 

 two rows, on lateral lobes of the leaf, con- 

 tracted into a many-times paniculate, immar- 

 ginate rachis, naked, sphtting longitudinally 

 outside. No indusium. 



II. Schizcea. Sporanges sessile in two or 

 Fiff. 636. 



Fig. 637. 







Schizsea dichotoma. 

 Fig. 636. A fertile pinna. Magnified 5 diameters. 



Fig. 637. A pinnule with sporanges. Magnified 25 

 diameters. ^ v^^^ 



four rows in linear, membranous-margined 

 lobes, pectinately opposite or digitate at the 

 apex of the leaf, set among hairs, splitting 

 longitudinally on the outside. No indusium. 



III. Lygodium, Sporangia sessile, alter- 

 nately biseriate on marginal lobes of the 

 leaf, sphtting longitudinally, each veiled by 

 a scale-hke, hood-shaped indusium adhering 

 transversely to the nerves. 



IV. Mohria. Sporangia sessile in one 

 row, close to the margin of the leaf, sphtting 

 longitudinally on the outside. A spurious 

 indusium formed by the revolute margin of 

 the leaf. 



SCHIZOCHLAMYS, A. Br.—A genus 

 of Palmellacese (Confervoid Algae). S. gela- 

 tinosa has been found on the continent, 

 growing on aquatic plants or floating free, in 

 little gelatinous masses composed of globular 

 green cells, 1-2000" in diameter, surrounded 

 by a hyaline ceU-membrane. The remark- 

 able pecuharity in this genus is the splitting 

 of the hyaline membrane into two or four 

 equal parts by regular, clean dehiscence ; the 

 internal cell-mass becoming divided at the 

 same time or remaining unchanged. By 

 frequent repetition of this splitting (the 

 internal cell acquiring a new coat each time), 

 the cell becomes surrounded by a number of 

 fragments of the old coats, held together by 

 a gelatinous matter. 



BiBL. A. Braun, Verjungung, §c. {Ray 



