42 CARL SKOTTSBERG, MARINE ALG^ 1. PJOEOPHYCEiE. 



Utriculidium Skottsb. 



U. Durvillei (Trévisan, Hariot; Hook. fil. et Harv. solum p. p.?) Skottsb. Ant. 

 Meeresalg. I p. 36. — Fig. 16 g — i. 



Falkland Islands: Cape Pembroke with Adenocystis, rare (St. 3, 7. 1. 

 08, gt.). 



In view of the fact that the cortex in the lower sterile portions of Adenocystis 

 is composed of radial cell-rows and that such cell-rows often are very distinct also 

 in the fertile parts, the suspicion might arise that the gametangia of Utriadidium 

 only represent a thick cortex and that the epidermal cells låter develop into assimi- 

 lators and sporangia. This is not the case. For among the numerous specimens 

 of Adenocystis examined I never found a fullgrown plant without assimilators, and 

 nearly all also bear sporangia. There are also patches on the surface of old 

 Utriculidium where the gametangia have disappeared, leaving some stray sterile cells 

 standing, not unlike what we have found in Ccepidium (see fig. 16 h — i). Hairs were not 

 observed on the material of 1902. This time I have found traces of old hair-pits. 

 This makes it the more probable that Utriculidium is the sexual generation of Adeno- 

 cystis. No young fronds were seen. While Utriculidium was collected in several places 

 from April to August in 1902, I only found it in one place this time. It is perhaps 

 better developed during the winter. 



Distribution: Fuegia, Falkl., S. Georgia. 



Cladochroa 1 no v. gen. 



Fröns disco basa! i pusillo affixa, filiformis, teres, tubulosa, irregulariter vel 

 subdichotome nec non flagellatim ramosa, ramis longis vel brevibus, ultimis tenuis- 

 simis apice cryptostomate instructis; structura anatomica parenchymatica ut in 

 Adenocystide, strata autem solum 4—5 prsebens, 2—3 interiora cellulis longioribus 

 (filamenta longitudinalia formantibus), 2 externa corticalia cellulis subcubicis ; sporan- 

 gia ovoidea; assimilatores simplices clavati, illis Adenocystidis simillimi. Cryptostomata 

 passim occurentia, pilis numerosis valde longis. Chromatophora disciformia. 



C. chnoosporiforinis nov. spec. — Fig. 17. 



Fröns ad 25 cm longa, 2 mm solum crassa, sat flaccida, colore obscure brunneo. 

 Sporangia 30 X 12 fi, assimilatores 50 X 12 jx. Pili 6— 9(x diam. 



Falkland Islands: West Falkl., near Halfway Co ve, on slate in the lit- 

 oral region (St. 4, 22. 11. 07, sp.). 



The external appearance of this plant does not suggest an affinity with Adeno- 

 cystis and hardly with any other member of the Encceliacese except Chnoospora, but 

 this genus, quite unknown from the regions visited by the writer, has gametangia 

 round the hairpits. The anatomical structure is like that of Adenocystis, and it is 



1 Chroa Reinsch, a synonym of Adenocyslis. 





