rounds the threads of Chcetomorpha cerea, sometimes even contin- 

 uous in a length of up to 15 mm. It hears some few scattered 

 hairs. 



Another form probably belonging to the same species has 

 been found b} T H. H. Gran at Espevaer on the south-western 

 coast of Norway. It forms small patches of indefinite shape on 

 old leaves of Zostera marina about 0.5—1-5 mm. in diameter and 

 often confluent. In elder crusts the thickening layer is about 

 50 — 100 ij. high. The plant bears here and there small bundles 

 of hairs. In some of the elder specimens I found young sori, the 

 bearers of the sporangia breaking through the cuticula layer and 

 rather much developed (60 — 80 /* long), but the sporangia was 

 not yet in development. The plant was collected in the later half 

 of July. 



In reference to the size and different shape on different sub- 

 strate Ealfsia pusilla is analogous to Myrionema strangulans. It 

 is when growing on Zostera not to be separated from the latter 

 without microscopic examination. 



The colour of H. pusilla also seems to differ rather much. 

 Thus the specimens from Marblehead are almost black in a dryed 

 state, while the mentioned form on Zostera from Espevaer has a 

 light olive brown colour. 



Haplospora globosa Kjellm.? 



On an excursion to Munkholmen in the Trondhj em-fjord in 

 the middle of October I found an Alga, which as to its vegetative 

 system most nearly coincides with the quoted species. It grew 

 on a small specimen of Ceramium diaphanum fastened to Zostera 

 marina in about 2 fathoms water. It is only 1 cm. long and 

 scanty branched, with branches of 2 or seldom 3 orders. The 

 branches of the first order are few in number, but not seldom 

 opposite. These as well as the main axis bear rather numerous 

 but generally very short, scattered branchlets issuing under a right 

 or nearly right angle, or sometimes bent downwards. The greater 

 number of the branchlets are transformed into plurilocular repro- 

 ductive organs, or bear a terminal one. 



The main axis and the branches of the first order are partly 



