198 BOTANICAL GAZETTE [MARCH 
America australis: Paraguay prope Paraguari 1893 (Exped. Reg- 
nell. Ima. Alg. no. 90); legit CA. M. Lindman. 
nium Wittrockianum Hirn, nov. spec.—Oe. dioicum nannan- 
drium, idiandrosporum, oogoniis singulis, breviter oboviformi-globosis 
vel subglobosis, poro foecundationis in superiore parte oogonii sito 
apertis ; oosporis globosis oogonia non plane complentibus, exosporio 
echinis conicis, spiraliter dispositis ornato, spiris 5-7, interdum anas- 
tomosantibus; cellulis suffultoriis eadem forma ac cellulis vegetativis 
ceteris ; androsporangiis 1-5—?-cellularibus; nannandribus in cellulis 
suffultoriis sedentibus, stipite subrecto; antheridio 1—2 cellulari; 
—— cell. veget. 38—45 m; altit. 2—3 plo majore; 
oogoniorum 63—73 * “ 68—75 4; 
‘** oospor. (sine acul.) 53—63“ ‘“  55—67 “ 
ae 4 3 “< 11—26 “ 
‘“*. stip. nannandr. ti—15‘* ‘ 50—65 “ 
“cell. antherid. g—t10* “ 20—23 “ 
Species valde insignis, ad species echinosporas pertinens. 
America australis: Paraguay ad prc 1893 (Exped. Ima Reg- 
nelliana. Alg. no. 81); legit G. 4. Malme 
i Malmeana Hirn, nov. spec.—S. cellulis Satria non 
ce vegetativis diametro 2-5 plo longioribus; chromatophoris 
spiralibus ternis vel quaternis ; cellulis sporiferis non tumidis, plerumque 
abbreviatis; zygosporis [positione ut in Spirogyra variabilt (Hass.) 
Kiitz.] ellipsoideis vel rotundatis, apicibus attenuatis, cellulas sporiferas 
longe non complentibus, membrana triplici preditis, exosporio hyalino, 
levi, mesosporio irregulariter areolato, fusco, endosporio lavi; crass. 
cell. veget. 67-88 w; crass. zygosp. 50-60 p, long. zygosp. 70-83 #- 
Brasilize in rivulo, in aqua fere stagnante ad Cuyaba civit. Matto 
Grosso 1894 (Exped. Ima Regnell. Alg. no. 104) ; legit G. 4. Maime. 
—Veit Wittrock, Stockholm. 
ALG IN THE SOLFATARA AT POZZUOLI, ITALY. 
DurRinG several visits to the somewhat active crater known as the : 
Solfatara my attention was drawn to the great quantity of dark greem 
slimy material found on the sides of the deep trench which leads to 
the principal outlet for steam, commonly known as the Bocce: 2 | 
cursory examination of the green substance showed it to consist of 
