212 



HOW TO KNOW THE MOSSES 



Capsule long-cylindrical, inclined, much curved, espe- 

 cially when dry and empty; yellowish- or reddish-brown; 

 mature in late spring or early summer. 



Operculum cone-shaped. 



Hygroamblystegium irriguum (Wils.) Loesk. {Am- 

 hlystegium irriguum (Wils.) Bryol. 

 Eur.) is frequently found in large 

 mats on stones along streams. The 

 stems have erect, crowded branches. 

 In the spring the young shoots are 

 erect and bright green, but darken 

 with age. 



Hygroamblystegium 

 irriguum 



Range, Ontario south to North Carolina and Missouri; 

 Europe; Asia; Africa. 



Hygroamblystegium fluviatile (Sw.) Loesk. {Am- 

 hlystegium fluviatile (Sw.) Bryol. Eur.) is generally 

 found floating in streams. The branches 

 are long and parallel^ less crowded than 

 in H, irriguum. 



Range, Newfoundland to Wisconsin, 

 south to New Jersey and Missouri ; Europe. 



Hygroamblystegium may be distin- Hygroamblystegium 

 guished from other water-loving mosses /w^-i^^^ « 



by the combination of small leaves, long slender capsule, 

 and stems leafless in the lower part. The species of Bra- 

 chythecium that grow on rocks in brooks, B. rivulare 

 (p. 247), B.plumosum (p. 247) and Bryhnia novae-angliae 



