392 
But, however this may be, it is at any rate very interesting that this 
intermediate form has now been found between the marine Rhodo- 
chorton Rothii and the true air-alga, Rhodochorton islandicam. 
As mentioned above, Rhodochorton Rothii can grow far above 
sea-level in places where it is not liable to be reached by the spray 
for a long period, and here in the Faeroes it 
is not only subject to dissipation, but owing to 
the rainy climate that prevails it is often soaked 
through by rain water, which explains its oc¬ 
currence in waterfalls near extreme high-water 
mark, so extreme that it can only be overflowed 
by the sea during very high water. Thus I 
found it south of Thorshavn, on the east side 
of Stromo, near Gliversnaes, where a small 
stream dashed perpendicularly down over the 
edge of a rock, and just where the jet of water 
fell on the subjacent rock, there Rhodochorton 
Rothii grew luxuriantly in dense, reddish-purple 
tufts, and Jonsson found it growing in similar 
localities near Klaksvig. The specimens found 
in waterfalls seem to correspond exactly to 
Rhodochorton intermedium Kjellm. 1 They had 
— what Kjellm an points out as characteristic 
of the latter — their main filament irregularly 
branched along their whole length and further 
scattered lateral branchlets bearing tetraspores 
(see fig. 61), while the branches of typical Rho¬ 
dochorton Rothii spring from a limited space 
on the main branch as is figured beautifully by 
le Jolis (Alg. Mar. Cherb., pi. V). This clustering 
together of the long branches in typical Rho¬ 
dochorton Rothii is often occasioned by the 
growing out of the tetraspore-bearing branchlets 
into numerous long branches after the tetrasporangia have fallen 
off (see fig. 62). I have often found this to be the case with 
the Fseroese specimens. The above-mentioned specimens from 
the water-fall resemble Kjellm a n’s not only in their different 
branch-system, but also in their erect filaments being of the same 
1 Kjellman, F. R.: Om Spetsbergens marina, klorofyllforande Thallophyter. 
I, p. 28. (Bihang t. K. Svenska Vet.-Akad. Handl B. 3, Nr. 7, 1875). 
Fig. 61. Rhodochorton Rothii 
(Turt.) Nag. Portion of fila¬ 
ment with lateral branchlets 
bearing tetraspores. 65: 1. 
