12 TASMANIAN BRYOPHYTA, 



four series : 1, Small forms with lidless cap- 

 sules ; 2, ovate-leaved forms, culminating in 

 Tortula; 3, narrow-leaved forms, reaching the 

 highest development in Barbula; 4, a genus 

 with a calyptra that grows greatly at the base 

 so as to form at maturity a large mitre, En- 

 calypta. Though placed as the last forms of 

 two series, Tortula and Barbula are very close, 

 and there is no line of demarcation between 

 them. 

 Lidless. 



EPHEMERUM : Capsule globose, apiculate. 



ACAULON : Capsule globose, not apiculate. 



PHASCUM : Capsule oblong. 

 Leaves broad, usually obtuse, with a shortly excurrent 

 nerve or hair point. 



POTTIA : Leaves ovate ; peristome absent. 



TORTULA : Leaves ovate to broad ; apiculate to hair 

 pointed ; peristome from rudimentary to well- 

 developed. 



STREPTOPOGON : Leaves broad, with a broad pale 

 border. 

 Leaves lanceolate, acuminate. 



WEISSIA : Small, erect ; leaves linear-lanceolate ; 

 peristome small or none. 



EUCLADIUM : Slender, erect ; leaves linear-lanceo- 

 late ; nerve vanishing. 



TORTELLA : Leaves linear, yellowish ; nerve short- 

 ly excurrent; peristome well-developed. 



LEPTODONTIUM : Habit procumbent, elongated ; 

 leaves ovate, acute ; peristome long, straight. 



HOLOMITRIUM : Decumbent ; leaves linear, green ; 

 nerve vanishing ; lid very long subulate ; peris- 

 tome teeth short, incurved. 



BARBULA : With a rufous tinge ; leaves shortly 

 lanceolate, acute, or acuminate ; peristome short, 

 to long, and twisted. 



ENCALYPTA : Small, erect ; calyptra very large, 

 mi triform. 



