525 
HYELLA Born, et Flah. 
207. H. caespitosa Born, et Flah. Sur quelq. plant, vivant d. le test 
calcaire des mollusques (Bullet, d.l. soc. bot. de France, Tome 36, 1889). 
var. typica. 
var. nitida Batt. New or crit. brit. mar. Algae. Journal of Bo¬ 
tany. Vol. 34, 1896. 
Both the forms were found in the sublittoral zone, down to a 
depth of about 20 fathoms, inhabiting the cells of various mollucs, 
e. g. Solen, Cyprina, etc. The cell-contents of var. nitida were purple 
or violet showing sometimes a transition to bluish-green. I have 
not seen any sporangia. 
Found hitherto only on S t r.: Vestmanhavn(!), Thorshavn(!), GliversnaesO). 
A Hyella , which occurred in Phymcitolithon polymorphum gathered 
from rock-pools at Arge near Thorshavn, had trichomes which meas¬ 
ured about 18—19 y in breadth; perhaps the plant is only to be 
regarded as a large variety of Hyella ccespitosa, but as I have only seen 
fragments, and have not succeeded in finding conidia, I have preferred 
to let it remain undetermined. 
Fig. 109. Hyella endophytica nov. spec. The lines above the 
three plants indicate the surface of Chondrus crispus. 370 : 1. 
208. Hyella endophytica nov. spec. 
A small plant of the Chameesiphonacece which occurred directly 
under the epidermis of an old fruiting specimen of Chondrus crispus 
appears to me to belong to 
the genus Hyella. I have shown 
some specimens ofitinfig. 109. 
It occurs as small, almost 
globular bodies, 40—80 y 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 to 5 y. 
The cells are enclosed 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 y and contain 
numerous tiny conidia. 
Conidiiferous specimens were found in June. 
I have referred to this species, though, doubtfully, another small 
plant of the Chameesiphonacece , which I found very sparingly, endo¬ 
phytic in the lamina of Laminaria liyperborea (tig. 110). It occurred 
directly under the epidermis of the latter in small irregularly shaped 
