322 3-WATER ALG^ FROM BUEMA.
The figure given by Reinsoh of Si. Seialdi is a veiy poor 0119, the front acd vertical views
of whioh do not oorrespond. The vertical view appears to us to be tlie more accurate. In addition
to the row of emarginate warts aloDg tlie three sides of th« apex of St. Sebaidi, there is also a
row of stout spines below thorn, which are somewhat ynriable in size and character.
Another species closely allied to S/. Sebaidi is Si. Mor.fcldtu Delp. (Desm. Subalp. 1877, p. 64,
t. 13, f, 6-19; W. & G. S West, Alg. N. Ireland, 1902, p. t. 1, f. '¿Q-, Alg. Orkneys aud Shetlands,
1905, p, 27, t. 2, f. 26), but the latter differs in the relatively smnller body of the semicells, the
more slender processes, aud in the absence of tlie rows of stout spines beneath the emarginate wurts.
The specimens observed from Burma were smaller than Reinsoh's oiiginal examples, and the
margins of the basal part of the semicells were \iudulate, but in other respects they agreed with
what we have always regarded as Sf. Sebaidi Reinsoh.
157. Staukastrum zonatum Borgesen, Desra. Brasil, 8a0, p. 4G, t. 5, f. 48.
Var. PRODucruM var. n. (Pi xvi, fig. 1-i).
Var. proceesibus duplo longioribus, apidbus somicellulanim mious elevatis
(subtruDcatis) et glabris.
Long, sine proc. 30-31^, cum proc. 44-46/x ; lat. sine proc. 15-5-17^, cum
proc. 52-56/1; lat. isthm. 11^,
Hah.—In the Kan-gyi at Mudon (No. 2450.5.)
In this Tariety the processes of one semioell alternate with those of the other. The length
of the processes is considerably gi^cnfer than in any other forms of Si. sinatum.
IÔ8. Staueastbum limneticum Schmidle. Ost-Africa Desra. 1898, p. 52, t. 4, f. 5.
Var. BuEiiENSE var. n. (PI. xvi, 6g. 13).
St. mediocre, cireitcr latius quam longum cum processibua, profuiide constrictum,
sinu valde aperto apiculato ad apicem ; semicelluloe late cuneataj. apice valdo
elevato et subtruncato, angulis in processua longos dentieulatos (processus unusquisque
annulis tribus vel quattuor denticulorum pra?ditis) regulariter et sursum curvatos productis,
apicibus processuum conspicue trispinatis; a verfcice vis® 5-radiata;, corpore
parvo, angulis in processus longos trispinatos productis ; processibus alterius semicellulai
cum iis alterius alteruantibus.
Long, sine proc. 31-32^, oum proc. 54-58 f,; lat. sine proc. cii-c. 17^, cum proc.
77-92 M ; lat. isthm. 7-5-8-5 fi.
/ i f l i . — I n the Kan-gyi at Mudoo (No. 24505),
Joshua (Burmese Desm. 188(5, p. 643, t. 24, f. 1, 2) describes a species from Burma under
the name of Si. plaUjcéy-nm, the vertical view of which resembles that o( St. iimmiicum var. Bwmcm,
but the prooesses are stouter and the body rather larger. Joshua's description and figures are very
imperfect,^ and if his fig. 1 on pi. 24 represents the f,ont view of Si. plali^cnim it is very much
of a canoatnre. Si. limniiicum var. Bvymmae ooourred abundantly, and its elegance of aspect, the
form of the seniiceUg with their elevated apices, and the direction of curvature of the processes at once
distinguish it from St. plaUjcerum.
St. livinsticum var. Burmnnse also resembles St. sUllintm, Turn. ("Freshw. Alg. E. India, 1893,
p. 119, t. 15, f. 6), but the form of the semicells is quite différant, and the processes are gracefully
and upwardly curved. Moreover, the processes are furnished with three or four rings of conspicuous
dentioulatione, and are not irregularly and ainutely undulate as in St. steUinum Turn., nor are the
peculiar marks present at the base of the semicells of tho latter species found in Si. limndicum
var. Bur mente.
STAURASTRUM. 223
_ It should also he compared with typical Si. limnelicum Schmidle (1. c.), from which it is di=.
tmguisliod by the different form of the semicells, and by the different natu.o of the more elegantly
curved processe... In Imneticum the processes are smooth on their upper surfaces, but possess
numerous denticulstlons on their lower surfaces, whereas in the var. Burmcmc the denticulations
ooEsist of three or four' definite and distinct rings, with four denticulations in each ring The
apices of the prooesses are also armed with three much longer spines.
Compare also wifli Hmneiicum Schmidle var. acnkaium Lemm. (Planktonalgen, 1899, p. 344,
t I, f. 10, 11), a variety of Sobmidle's species obtained from the planktou of Lake Wakatipu'
Wew Zealand, Tins variety approaches very closely the var. Burmome. The latter diffei-s, however'
in the more elevated apices of the semicells, and in Ihe fewer and more distantly placed rings of
denhculations on the proca^es. In specimens of var. i^ly examined from the plankton
of Victoria Nyan^a, the denticulations ("aculei") on the process were much more numerous than in
var. Bwmense and were to a certain extent iireg^ularly scattered.
159. Staukastrum tadphorum W. & G. S. West, Freshw, Alg. Ceylon 1902 n
191, t. 22, f. 23-25. » J » > FForma
Bltrsiense. (p], xt, fig. 28).
Forma processibus magnis longioribus, processibus parvis profunde bifurcatis (T—
formatis) ad basin semicellularum minoribus.
. Long. 62m; lat. cum proc. 115-123^; lat. isthm. 7^.
JIal.—h\ the Kan-gyi at Mudon (No. 24505).
160. SrAURASTEDM DI.STENTUI1 Wolle, 1882; Desm. U. S. 1884, p 149 t 41
f. 15 16 (figures eii'oneous); W. & G. S. West, Some Desm. U. 's. 1898'
p. 316, fig. xylogr. M~f (p. 315). '
Long. 23-24;.; lat. 32-35;..
//ai.—Mansang, near Hsipaw (No. 24193).
at """ • ^p^-
Tie De„,,id „ c n t l ; desoribrf from Br.al by Borge „ S,. (b„„ _
Begnell. Espri., .¡. De=mid. 1903, p. 10", t, 4, t. 13) ¡, a ™iv .lo.e all, rf S
Wolle, i„ l.„t a „ „ be s e p . , . « f „ „ it. A „ o , L ve.v e l . s V a L p.»^, f X T T -
Sohmidle (O.l-Afrita De.mid, 1898, p. 56, t 4, I 13). ' ' ' "
161. Sm o w s t k o i MADBicoENDTroi Koy & Bias. Jap. De™. 1886, p. 240, t. S68
¡ . t h J : " ! , . " " 30,, 1«.
Maosang, near Hsipaw (No. 24193).
162. Staurasteum Hantzschii Reinsch, 1867.
Var. CONGKUUXI (Racib.) W. & G. S. West
p. 257, t. 16, f. 15. '
Si. Jiemrdi Reinsch var. congruum Racib., ]
Bt. Hanisschii âepaupcraium Gutw., 1892.
intrieatum Delp. (in parte).
N. Amer.
A«n. Roy. Bot. Gard. Cai.outj-a Voi. VI.