ZYGODONTEI. 217 



Oeder XXI. ZYGODONTEI, Br. & Schimp. 



Sporangium striated, pyriform ; peristome none, single or 

 double; veil hood-shaped, smooth. Mosses with the habit of 

 Gymnostomum. 



Differing principally from Orthotrichei in their smooth, 

 hood-shaped veil. 



69. ZYGODON", Hook, fy Tayl. 

 Sporangium striate, apophysate, immersed or exserted ; 

 veil small, oblique, hood-shaped, smooth ; peristome none, 

 single or double, outer when present of thirty-two divisions 

 united two or four together, so as to make sixteen or eight 

 teeth ; inner sixteen or eight cilia alternating with the teeth 

 of the outer peristome. Perennial tufted Mosses, with punctate 

 leaves and plane, not revolute margins. 



1. Stem tall, sporangium cylindrical. 



1. Z. Forsteri, Wils. ; monoicous; stems densely tufted; 

 leaves erecto-patent, acuminato-spathulate, hyaline below; 

 sporangium pyriform, long-necked, striate ; lid with a curved 

 beak; outer teeth strongly recurved when dry. — Hook. &; 

 Wils. t. xlvi. ; Eng. Bot. t. 2225. 



Trunks of trees. South of England. Hare. Bearing fruit 

 in spring. 



Forming dense, succulent, green tufts. Stems matted with 

 •whitish rootlets; leaves dark-green above, pale towards the 

 base, then red ; outer teeth eight, yellowish ; cilia hyaline, a 

 little shorter. 



2. Z. conoideus, Hook, fy Tayl. ; dioicous ; loosely tufted ; 

 leaves spreading, curved upwards, lineari-lanceolate, acumi- 

 nate; nerve ceasing near the tip; sporangium oblongo-pyri- 

 form, striate ; lid with a long beak ; outer teeth trun- 



