ANDREiEI. 309 



rose, pvato-acuminate leaves. The squarrose varieties of 

 H. cymbifolium and cuspidatum may be kuown by their leaves. 



Family IV.— SCHISTOCARPI. 

 Sporangium quadrifid or multifid ; receptacle elongated. 



Ordeb XXXIV. ANBBE^I, Lindl. 



120. ANDREiEA, Ehr. 



Fruit acrocarpous ; receptacle elongated ; sporangium sessile, 

 four-cleft or four-valved, united above by the persistent lid ; veil 

 mitriform ; leaf-cells punctiform. 



* Leaves nerveless. 



1. A. alpina, Dill. ; stem elongated; branches fastigiate; 

 leaves crowded, erecto- patent, even, obovate, acuminate, con- 

 tracted in the middle, mostly entire above, toothed below ; 

 inner perichsetial leaves convolute. — Hook, fy Wils. t. viii. ; 

 Eng. Bot. t. 1278. ; (Plate 2, fig. 6.) 



On alpine rocks. Bearing fruit in early summer. 



Monoicous; bearing the antheridia on slender innovations; 

 forming dense tufts 2 or 3 inches high. Leaves often contracted 

 below so as to be somewhat Ungulate or panduriform, even, 

 reddish or purplish, abruptly pointed ; leaf-cells punctiform 

 above, elongated and vermiform below ; walls very thick ; spo- 

 rangium apophysate when young ; valves reaching to the apo- 

 physis ; perichsetial leaves large ; the inner ones convolute. 



2. A. petrophila, Ehr. ; stem short ; leaves patent or sub- 

 secund, ovate, acuminate, but rather obtuse, papillose behind ; 

 perichsetial leaves large, convolute. — Hook, fy Wils. t. viii. ; 

 Eng. Bot. t. 1277.; {Moug. # Nest. n. 115.) 



