582 Mr. Hookxenr’s Observations on Andrea. 
that though, as remarked above, its appearance seems rather to 
assign it a place with the Hepatice, there will nevertheless be 
as no difficulty to exist in allowing it to continue, as it now 
generally stands, among the Musci. 
The genus by Ehrhart himself was placed in the third order 
of the 24th class of Linnzus (the Alge), which at that time 
contained what are now called Hepatice. He was, in all proba- 
bility, induced to leave it there, from a reluctance to make al- 
terations that did not appear absolutely necessary, and from its 
affinity to the genus Jungermannia in the same order, without 
considering the character of this order as given by Linneus :— 
* A plant whose root and stem-leaves are all in one.” It is how- 
ever extraordinary he should have done so, since the definition 
of the genus Andrea, as first drawn out by himself, has so many 
characters in common with the Musci, and so few ue are ana- 
logous to any thing among the Alge. | 
For the benefit of those who may not. have an opportunity of 
seeing the Beitrüge, where iti is contained, à "e bere ber ane 
this definition. ph shige stat 
« ANDREA. 
* Perichetium squamosum. 
* Squame lanceolatz, carinatze, imbricate. 
_ © Anthophorum longitudine perichetii. dO SW 
* Calyptra conica, brevissima. Met 
* Stylopodium nullum. ! 
** Conioecium oblongum, subtetragonum, 4-sulcatum. 
** Apophysis turbinata. 
* Valvule quatuor carinate, angulares, basi apophysi apicibus 
conjunctorio adnate. 
« Siue 
