THE BRYOFHYTA OF ICELANI) 449 



The entire height of the plant was about (> mm. The scta was 

 about 5 mm. high. The capsiiles were, without the lid, about 0.5 mm. long. 



47. Ditrichum hotnomallum (Hedw.) Hampe. 



Fl. Dan. tab. 2688, ex Islandia leg. Morch. E. Iceland. Vestdalur 

 near Seydisfjordur!, sterile. N. Iceland: Hof" near Eyjafjordur O. D.il, 

 sterile. W. Iceland: Reykjavik Grl.;!), fr. ; hot spring near Grafarbakki 

 (F.)!, sterile; Hafnarfjordur, at the bottom of a lava cavel, sterile. S. Ice- 

 land: Geysir! $. 



Around Reykjavik it was rather common along the side of ditches. 

 There the fruit was ripe on August 7th. Near Geysir it occurred in 

 extensive mats. about 1 — 2 cm. deep, on warm clayej^ flåts with a tem- 

 perature of 35—40'^. 



48. Ditrichum flexicaule (Schleich.) Hampe. 



One of the most commonh' occurring mosses; it is met with on 

 almost everj^ substratum and at all attitudes. It grows both on damp 

 or soil-covered rocks and in bogs, where it especially occurs woven 

 into the tufts found there, and on damp or on more dry gravell}' soil, 

 in lava caves, in grass fieids, in heaths, etc. 



This species varies considerably , especiallj' as regards the length 

 and direction of the leaves. Short-leaved forms (/. bvevifolia) are fre- 

 quent on more dry ground, where they form dense tufts with stiffly 

 erect or slightly secund leaves. On damp ground and especially in 

 sheltered localities, for instance among stones, or in clefts, the leaves 

 become longer, often strongl}' secund, and the tufts higher and looser. 

 Fruit it very rare. Near Seydisfjordur, in the beginning of July, the 

 setæ had not developed to their fuli length and the capsules were 

 barely formed. 



49. Sælania cæsia (Vill.) Lindb. 

 Ditrichum glaiicescens (Hedw.) Hampe. 



E. Iceland: Breiddalur!; Hallormstadr!. N. Iceland: Vidimyri (Grl.)!; 

 several piaces near Eyjafjordur (O. D.;!). W. Iceland: Husafell (Grl.)!; 

 Kalmanstunga (Grl.)!; Gilsbakki!; Hafnarfjordur!; Esja!. S. Iceland: Skål- 

 holt!; common near Thingvellir!. 



This s]3ecies is rather common, especially in W\ and SW. Iceland, 

 in soil-filled rock and lava clefts, as a rule associated with Mniiim 

 orthorrhynchum, Playiotheciiim Roeseanum, P. pulchelhim, Pohlia cruda, 

 Distichiiim montaniim, etc. 



In the wood b\' Hallormstadr it was growing on the ground in 

 companj' with Bartramia ityphylla, Pohlia cruda, Distichium inclinatum 

 and Ditrichum flexicaule. The fruit, whicli is almost always present, 

 ripens in the middle or at the end of June. The plant has not been 

 observed at a higher altitude than about 200—300 metres. 



