Fmtsch and Takeda . — On a Species of Chlamydomonas. 377 
however, are not parietal but lie near the inner face of the chloroplast. 
Moreover, this species has a very thin cell-wall, without any gelatinous 
layer, and a poorly developed papilla. The stigma is situated near the 
centre of the cell, and is often very long. 
The most striking feature presented by C. sphagnicola is certainly the 
customary doubling of the papilla at the anterior end of the cell. A some- 
what similar condition has been recorded and figured by Wollenweber 1 in 
the case of certain species of Haematococcus (= Sphaerella ), in which the 
flagella occupy the same position with reference to the two papillae as in 
our species. It can hardly be doubted that the paired papillae are the 
result of fission of the single structure normally present in other species 
of Chlamydomonas , &c., and occasionally even developed as such in 
C. sphagnicola. 
In conclusion, we append a Latin diagnosis : 
Chlamydomonas sphagnicola (Fritsch), Fritsch and Takeda, comb. nov. 
(Figs. 1- 14). 
Syn . : Isococcus sphagnicolus , F. E. Fritsch, in New Phyt., xiii, 1914, 
P- 35 L Fig- 1. 
Cellulae vegetativae (= zoogonidia) pro genere magnae, late ellipsoi- 
deae, non raro ellipsoideae vel oblongo-ellipsoideae, polis aut rotundatis 
aut subacutis, interdum subglobosae vel globosae. Membrana cellularum 
crassissima, pars exterior firma ad 1 ft crassa, pars interior gelatinosa 
plerumque bene evoluta, ad 4 /x crassa, polo anteriore papillis duabus vel 
tantum papilla singula plus minus biloba vel rarissime integra praedita. 
Flagella ca. ad ijplo longiora quam corpore cellulae, rostro protoplasmatice 
afifixa. Chromatophora singula, urceolata, viridis, densissima, granulata ; 
pyrenoidibus parietalibus, 4 vel pluribus, plus minus globosis, conspicuis ; 
stigmate conspicuo, lenticulari, fere anteriori ; vacuolis contractilibus duabus ; 
nucleo centrali. Propagatio subdivisione cellulae matricalis longitudinaliter 
in 2, vel 4, rarissime 8 partes fit. 
Hab. : In Sphagnis, Keston, Kent (F. E. Fritsch, May, 1914-May, 
1915) ; in stagno, Richmond Park, Surrey (H. Takeda, December, 19153 
January, 1916). 
The greater part of the present reinvestigation was carried out in the 
Jodrell Laboratory, Royal Botanic Gardens, Kew. We take this oppor- 
tunity of expressing our thanks to Sir David Prain, C.M.G., for the facilities 
afforded to us. 
1 Ber. Peutsch. Bot. Ges., xxvi, 1908, p. 245, Fig. 3 a and b, Fig. 7, and Tab. XIIT, Figs. 1, 5-8. 
I) d 2 
