"- g 
~A 
DESMIDS FROM SINGAPORE. 157 
Forma eranuLaTA. (Pl. 8. fig. 10.) 
Forma cum membrana regulariter et dense granulatá, polis 
glabris. 
Long. 63 u ; lat. 164; lat. apice. circ. 7 p. 
4. P. crasstuscutum, De Bary, Conj. p. 73, t. 5. ff. 5-7. 
Long. 64 u; lat. 23 p. 
5. P. AUSTRALE, Racib. in Rosprawy Akad. Umicj. Krakow. 
Wydziat nat.-przyn. Ser. II., ii. (vol. xxii.) p. 367, t. 6. f. 27. 
Long. 65-69 u; lat. 38-40 p ; lat. isthm. 37 p. (PIL. 8. fig. 16.) 
The specimens observed are exaetly typical as regards form, 
but they are more minutely punctate and the glabrous zone is 
narrower than in the type. 
Cosmarium subturgidum, Schmidle [ Disphinctium subturgidum, 
W. B. Turn.], f. minor, Schmidle, in Hedwigia, xxxiv. (1895) 
p. 300, t. 4. fig. 2, seems to us much nearer in form to P. australe 
M to C. subturgidum although the chromatophores seem to 
iffer, 
Schmidle remarks (in Engl. Bot. Jahrb. xxiii. (1896) p. 256) 
that C. zonarium, West & G. S. West, in Trans. Linn. Soc. 
Ser, IL, Bot. v. (1895) p. 71, pl. 8. f. 13, is the same as C. sub- 
Meam var. minor. It is certainly very near his variety, and 
that » same arrangement of the chlorophyll, but we are sure 
the fs : Zonarium is a very different plant from C. subturgidum ; 
This _ 18 quite different, so is the size and so are the markings. 
e were certain of at the time we described the former. 
6. PENTIUM sp. 
ane 175-19 u; lat. 7-5-8:5 p. 
ew specimens only were seen of this small species; it is 
very slightly constricted in the middle, and the poles are rounded 
and a little truncate. 
; CLOSTERIUM, Nitzsch. 
s DIDYMOTOCUM, Corda, Alm. de Carlsbad (1835), t. 5. 
09; Ralfs, Brit. Desm. p. 168, t. 28. f. 7 a et b. 
Var. TROPICUM, n. var. 
ar. M LI . . LI . . 
satis - entre subrecto, dorso convexiori, polis dilatatis incras- 
; Membrana glabra, lutea vel luteo-brunnea. 
ng. 238-309 q. . 
K; lat. 36-44 u; lat. apic. 17-19 p. 
N2 
