HYALOTHECA. 



225 



semicellul* transverse oblongo-traneziformps Wr,'K, 1Q „™ 



.. . £ • m A , ? "apo^uormes, latenbus convexis sursum converircntibus 



anguhs mfenonbus rotundaUs, angulis auperioribns processus breves crasso, 2 .bii,.. 



Ffr fT" tlbUS ' api , C , e , ktlSslmo et rect °. eum seriebus duobus punctorum (salpe 

 ond.stinct.s) trans semicellulam unamquemque; a vertice visa, anguste elliptic;,, rati,',. 

 axmm circiter 1x2-5; a latere visas subcirculares. 



Long. 20-23* ; lat. 27-29„ ; lat. irthm. 6-7 M ; crass. 1* ; long. proc. apic. 2-8-3-2„. 



Sab. — Mansang, near Hsipaw (No. 24193) 



This plant was very abundant from the above-mentioned locality, ooonrring in long filaments 



showed 



The cells are of a very characteristic shape, and no oth 



they nre slightly 



of the genus possesses such a narrow, closed sinus. The apical connecting.] .room*, by reejon of 

 their shortness and stoutness, are also unlike those of any other species, although 

 suhcapitate at the extremity. 



The two transverse series of punctulations across the front of the eemicclls, which are diipoted 

 rather nearer the apex than the base, are sometimes difficult to detect, but they are probably present 

 in all specimens if carefully searched for. 



Genus: Hyalotheca Kutz. 



167. Hyalotheca dissiliens (Sm.) Brib. in Ralfs' Brit. Desm. 1848, p. 51, t. 1, 



f. 1. 



Aplanosporse globosse et glabrae, intra cellulas singulas forn.at«*i\ 

 Long. 16-17,; lat. 26*5-30/*; diam. aplanosp. 23-25/*; (PI. in, figh 11-15). 

 Sab. — In springs on the river bank, Bhamo (No. 21501.) 



Both the * forma bidentula * and ' forma tridentula * occurred in abundance, and the plant! wer» 

 of great interest owing to the formation of aplanospores within the individual oelk Aplanospores 

 have been observed in Hyalotheca neglecta Eacib. (vide W. & G. S. West, Obs. on Conj. 1898, 

 p. 54, t. 4, f. 23-27), in which species the dissociation of the filaments does not take 



Aoe 





metrical mother-cell. 



until the spore-formation is almost completed, and the mother-cells do not change their shspe or 

 increase in size. In the specimens of H. dissiliens observed from Burma, diseociaiion of the 

 filaments had taken place before the aplanospore-formation, exactly as it does previous to conjuga- 

 tion and the formation of zygospores. Shortly after the cells become free they begin to increase 

 in volume by a growth in length, ultimately becoming as long as broad. The chloroj. lasts soon 

 show signs of disintegration, and then the entire protoplasmic mass aiiumes a spherical shape, 

 becomes invested with a thick cell-wall, and forms a globular aplanospore. The increwe in I he 

 length of the cell is often unequal, resulting in an asyn 



168. Hyalotheca Burmensis sp. n. (PI. xn, figs. 1-4). 



H. mediocre, filis non tortis, sine vagina mucosa ; collate paullo latiorc* qaam 

 long*, subquadrat*, non constrict*, lateribus subangulariter convex* ap.cibus late 

 trnncatis rectisqne ; a vertice vis* circular. Zygospore late oblongo-elhphc*, 

 marginibus irregnlariter nndulatis vel nodulosis pnecipue polos versus. 



Long. 18-20 ;| lat. med. cell 22,; lat. apic. 19-20,; long, zygosp, 29. ; 

 lat. zygosp. 22-23,. 



Ha b.— Mansang, near Hsipaw (No. 24193). 





Ann. Eot. Bot. Gakd. Calcutta Vol. VI. 



