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CRYPTOGAMIA FILICES. 64^ 



furrows, and terminated with a black oval 

 fpike. The dents of the vagina are acute and 

 black, and of the fame number v.-ith the fur- 

 rows. 

 Halter is of opinion that this Is no other than a 

 variety of tlie foregoing. 



ftuviaiik 5 EQUISILTUM caule flriato, frondibiis fubfim- 

 plicibus. Sp. fl. 15 1 7. (Ger. cm. m^, f. 1. 

 BJackwel /. 2 1 7 j 

 Great River Horfe-tail. Am^Us. 

 Ear-buil-cich. Gaiilis. 

 , , In fliady marllies, and on the brinks of ilagnant 

 ■ ' ■ • waters. % . V. 



This is the largeil: of all the Brili/J:) fpecies of this 



■ ■ . genus. The ftalk is a yard high, and ibme- 



, , times near an inch in diameter, oi" a pale or 



] ', . whitifh colour at firft, but blackifli in decay, 



fofr, hollow, and divided into numerous joints;. 

 ■.,..,: 7 he leaves are nearly quadrangular, generally 



jimple, undivided, and grow commonly from 

 24 to 30 in a whirl, and in fome luxuriant fpe- 

 .;,• . cimens even 40. The va^v^^ are ilriattd, and 

 . . . ' divided into as many long, linear dents as there 



,, , , are leaves in ths whirh. The fpikes of fructi- 

 fication grow on naked flalks, difliiKft fro-n the 

 .. • . - foliaceous ones, but fronj the fame root, and src 

 .. ., ■ replete with a bluilTi powder. 



•,, .•:, Halicr tells us tiiat tli:s kind of Eq^uifelum was 

 : ; eaten by the Remans, and Linn^us affirms that 



oxen 



