525 



HYELLA Bom. et Flah. 



207. H. cæspitosa Horn. et Flah. Surquelg. plant, vivant d. le lest 

 calcaire des mollusques (Hullet, d.l. soe. bot. de France, Tome 36, 1889). 



var. tgpica. 



var. nitida Batt. New or t rit. brit. mar. Algæ. Journal of Bo- 

 tany. Vol. 34, 1896. 



Both the forms were found in the sublittoral /.duc down to a 

 depth of about 20 fathoms, inhabiting the cells of various mollucs, 

 e. g. Solen. Cyprina, elc. The cell-contents of var. nitida were purpie 

 or violet showing sometimes a transition lo bluish-green. I have 

 not seen any sporangia. 



Found hitherto only on S t r. : Vestmanhavn !), Thorshavn ! ,Gliversnæs ! . 



A Hyella, which occurred in Phymatolithon polymorphum gathered 

 from rock-pools at Arge near Thorshavn, had trichomes which meas- 

 ured about 18 — 11) /» in breadth; perhaps the plant is only to be 

 regarded as a large variety of Hyella cæspitosa, hul as I have only seen 

 fragments, and have not succeeded in tinding conidia, I have preferred 

 to let it remain undetermined. 



208. Hyella endophytica nov. spec. 



A small plant of the Chamæsiphonaceæ which occurred directly 

 under Ihe epidermis ol' an old fruiting specimen of Chondrus crispus 

 appears to ine to belong to 

 the genus Hyella. I have shown 

 some specimens ofitin lig. 109. 

 It occurs as small, almost 

 globular bodies, 40 — 80// in 

 breadth formed by more or 

 less richly ramified cell-fila- 

 ments. The cell-division occurs in all directions. The apical cells are 

 longest, about twice as long as they are broad; the others are about 

 as long as broad. The breadth of the cells varies from 3 lo 5 .". 

 The cells are encloscd in an envelope and have contents of a 

 bluish-green colour. The cells situated towards the periphery of 

 the Chondrus are produced into conidangia; the latter are some- 

 what larger than the vegetative cells, about 4 — 10 /< and contain 

 numerous tiny conidia. 



Conidiiferous specimens were found in June. 



I have referred to this species, though, doubtfully, another small 

 plant of the Chamæsiphonaceæ, which I found very sparingly, endo- 

 phytic in the lamina of Laminaria hyperborea (lig. 110). It occurred 

 directly under the epidermis of the laller in small irregularly shaped 



l'ig. 10!). Hyella endophytica nov. spec. The lines above the 

 three piants indicate thesurface of Chondrus crispus. .'iTu : 1. 



