the bryophyta of iceland 437 



Fam. RHABDOWEISIACEÆ. 

 11. Cynodontium polycarpum (Ehr.) Schimp. 



Seydisljordur (C. Hansen) !. 



This species together with the var. strumifcriim, is recordcd by 

 Valil, but has without doubt been confused witli another species, pro- 

 bably a Dicnimim or Oncophonis. Morch also records both forms 

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

 hagen sonie are Dicranum Slarckei, and some are Ceralodon pnrpiirciis. 



Cynodontium gnicilesccns var. tenellum is recorded by Carrington 

 from Alvureyri, but has undoubtedh* been confused with another species. 



12. Dichodontium pellucidum (L.) Schimp. 



Very common everywhere on damp ground. 



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

 there everj'where on damp ground, botla 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 Icvels it occurs more sparingly, but is nevertheless fre- 

 ([ucntly found up to about 600 metres above sea-level. Only sterile 

 specimens have been found. 



Fam. AONGSTRCEMIACEÆ. 

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



E. Iceland: Hornatjordur 1; Hof!; Seydisfjordur!; Vallanes!. N. Ice- 

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

 near Hrutafjordurl. XW. Iceland: .4rmuli!. 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 

 rarely, as for instance near Hornatjordur and Breidabolstadr. abundantly 

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

 Dicranella Schreberi, Bryiim lacustre, Dichodontium and other species in 

 piaces where the peat had been pared oft". 



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

 the material brought home had been investigated, because in liabit they 

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

 sterile Anomobryum. 



On boggy ground it was usually collected together with Dichodon- 

 tium pellucidum, Oncophonis Wahlenbergii, Meesia trichoides, Brynm spp., 

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

 crispa, Didymodon rubcllus, Blasia pusilla and Haplozia atrovirens and in 

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



