32 HENRIK PRINTZ [1920 
well defined types will be restricted to a comparatively small 
number, but in return, with a rather wide range of variation. 
Phycopeltis flabelligera (Dr Toni) Hanse. Ueb. Gatt. Crena- 
cantha, p. 59. Hansgirgia flabelligera Dr Tonn, Syll. Alg. I, p. 363; 
Dr WiLpeEMman, Ubserv. sur quelq. dAlgues Terrestres Epiphytes 
(Bull. Soc. Belgique 1888); Å propos de I Hansgirgia flabelligera 
(Soec. royale bot. Belgique 1889). 
This species is rather frequent in some samples from the 
environs of Durban, above Bluff, between Eastern Whaling Com- 
pany's station and Isipingo Kraales, collected Nov. 17th (mos. 194, 
207) and in a single sample from the water-place at Saldanha Bay, 
March 13th (397), where it 'occurs together with some other 
Chlorophyceae as a coating on various straws and rush. Already 
by a slight magnification it is seen to differ from the preceding 
species in an irregular and indented circumference. The pictures of 
Dr WirLpeman's in Obs. Alg. Ter. Epif. fig. 9, moreover, give a good 
idea of the appearance of this alga. On close secrutiny the species, 
moreover, evinces a wide range of variability. The cells are rather 
irregular, 3,4 or 5 angular, nor are the dises by far so regularly made 
up as in the preceding one. Besides, this species is more apt to dila- 
pidating into single fiiaments. From a central dise, built of compara- 
tively short and broad cells, it will be seen that the cell-rows very 
frequently split and grow forth rather irregularly. The cells of 
these free rows are, as a rule, more inflated than those of the solid 
dise, where they, because of the mutual compression, are apt to ta- 
king a more rectangular or polygonal shape. Also in the central dise 
itself are often to be found rents between the cell-series. Casually 
broken and isolated cell-rows are capable of continuing their growth 
nearly as a real Trentepohlia. It emits lateral branches, and I have 
observed intercalary cell-divisions and forming of sporangies in 
such specimens. 
This species, which previously has been described by De Tonr 
as a distinct genus, Hansgirgia, thus seemed to form a transition 
between the genera Trentepohlia and the true Phycopeltis (sect. 
kEuphycopeltis Witte). To maintain the genus Hansgirgia accord- 
ing to the limitations given by Dr Tonr, does not seem to be 
systematically well founded, now that we have got å more exact 
knowledge of these forms. As to the appearance of the species, the 
accompanying pictures on pl. XII will give an idea thereoff. The 
size of the celis is varying, on an average between 5—7 u in breadth, 
at times up to 8—10 yu. The dise-sporangies are globose or ellipsoid, 
somewhat larger and more tumid than the vegetative cells. 
