NOTES ON INDIAN CHAROPHYTA. 361 
Stipulodes present, though sometimes rudimentary. Branchlets of 
4 or more segments. Bract-cells normally 4 or more at a node. 
Oogonia and antheridia produced side by side from separate 
peripheral cells of the branchlet node .............................. 4. LYCHNOTHAMNUS. 
Oogonia and antheridia produced from the same peripheral cell of 
the branchlet-node, the antheridium below the oogonium ...... 9. CHARA, 
KEY ro THE SPECIES. 
1. NITELLA. 
Branchlets in each whorl in one series, nearly uniform in length and 
extent of furcation esse esse Homooclemz. 
Dactyls (= ultimate rays) each consisting of a single cell .................. Anarthrodactyle. 
Dieeious. Oogonia clustered, conspicuously stalked; one anthe- 
ridium sessile, terminal, others produced laterally at the same 
node, stalked. Branchlets once-forked, dactyls + mucronate, 
Coronula deciduous. Oospores c. 375-475 p long.................. 1. N. mirabilis. 
Moneecious. Oogonia solitary, geminate, or rarely 3 together, sessile. 
Antheridia sessile, solitary. Branchlets once-forked, dactyls with 
very long acuminate points. Coronula persistent. Oospores 
c. 250-300 p long ...... eee Mh hene ne 2. N. acuminata. 
Dactyls each consisting of 2 or more cells....................................... Arthrodactyle. 
Dactyls all or mostly 2-celled. Ultimate cell conical. 
Diecious. 
Branchlets up to 4 times forked. Dactyls 3-5 uneqnal, primary 
rays elongated ........ cesses eH 3. N. dispersa. 
Branchlets 2-3 times forked. Dactyls usually 6 equal, elongated 
Cylindrical 444 Henn 4. N, sp. nov. ? 
Moneecious. 
Dactyls not much abbreviated. Ultimate node usually fertile. 
Rays at second forking usually 2-3. Primary ray less than 
half the length of the branchlet. Dactyls usually partially 
3-celled, of unequal length, the lower cell rounded at apex, 
ultimate cell narrow mucro-like. Gametangia usually 
produced at all the forks of the branchlets .................. 5. N. mucronata, 
Rays at second forking 4-6, Dactyls uniformly 2-celled, of 
about equal length. 
Gametangia usually produced at the first as well as other 
forks of the branchlets. 
Plants of medium size, whorls attaining a diameter of at 
least 18 mm. 
Young fruiting whorls not enveloped in a mucous cloud. 
Primary rays elongated ................................. 6. N. pseudo-flabelluta. 
Young fruiting whorls enveloped in a mucous cloud. 
Branchlets of nearly equal length, 2-3 times forked. 
Penultimate ray not very short. Dactyls usually 
5. Oospores c. 300 p long. Mucous cloud very 
dense essieu eene 7. N. mucosa. 
Branehlets of very unequal length, 2-3 times forked. 
Penultimate ray much abbreviated. Dactyls 5-6, 
very long and slender and curved at the base, 
Oospores c. 200-225 u long. Mucous cloud 
ineonspieuous — sss HH 8. N. Wattii. 
