THE BRYOPHYTA OF ICELAND 437 



FAM. RHABDOWEISIACE.E. 

 11. Cynodontium polycarpum (Ehr.) Schimp. 



Seydisfjprdur '^C. Hansen) !. 



This species together with the var. strumiferum , is recorded by 

 Vahl, but has without doubt been confused with another species, pro- 

 bably a Dicrannm or Oncophorus. Morch also records both forms 

 from Iceland, but of his specimens in the Botanical Museum in Copen- 

 hagen some are Dicrannm Starckei, and some are Ceratodon purpurcus. 



Cynodontium gracilescens var. tenellnm is recorded by Carrington 

 from Akureyri, but has undoubtedly been confused with another species. 



12. Dichodontium pellucidum (L.) Schimp. 



Very common ever3 7 w 7 here on damp ground. 



This plant is most widely distributed in the lowlands and is found 

 there everywhere on damp ground, both in bogs and on gravelly soil 

 along streams, and also on soil-covered rocks. In the lowlands it usually 

 grows mixed with all kinds of other mosses in their tufts and is, as a 

 rule, low in growth and short-leaved. On rocks near the water, where 

 it is also frequent, more vigorous forms occur in unmixed tufts, 2 4 cm. 

 high. At higher levels it occurs more sparingly, but is nevertheless fre- 

 quently found up to about 600 metres above sea-level. Only sterile 

 specimens have been found. 



FAM. AONGSTRCEMIACE.E. 

 13. Aongstroemia longipes (Sommerf.) Br. eur. 



E. Iceland: Bornafjordur!; Hof!; Seydisfjordur !; Vallanes!. N. Ice- 

 land: Akureyri (O. D.;!); Husavik!; Vidimyri!; the Tvera!; Dettifoss!; Stadr 

 near Hrutafjordur!. NW. Iceland: Armuli!. W. Iceland: Haukadal!; 

 Lundur!; Alafoss!. S.Iceland: Breidabolstadr!; Barkarstadr!; Seljaland!. 



This species is doubtless common everywhere, but is often over- 

 looked on account of its minute size. It grows on damp ground, most 

 frequently as single specimens scattered among other mosses; more 

 rareh 7 , as for instance near Hornafjordur and Breidabolstadr, abundantly 

 on peat along ditches. Near Lundur it grew abundantly associated with 

 Dicranella Schreberi, Bryum lacustre, Dichodontium and other species in 

 places where the peat had been pared off. 



In the majority of the cases the specimens were not found until 

 the material brought home had been investigated, because in habit the} 7 

 exactly resemble the tiny Pohlia-forms of wide occurrence, or a small, 

 sterile Anomobryum. 



On boggy ground it was usually collected together with Dichodon- 

 tiam pellucidum, Oncophorus Wahlenbergii, Mecsia trichoidcs, Bryum spp., 

 etc. On gravelly soil near Stadr it was found associated with Dicranella 

 crispa, Didymodon rubellus, Blasia pusilla and Haploiia atroinrens and in 

 several places with Distichium inclinatum. It occurs both in the low 



