1879.] 189 [Halsted. 
Exsiccatae: Braun, Raben. and Stiz. Char. Exsic., 14. 
Plants long and slender, slightly incrusted ; whorls remote ; leaves 
4-6 cm. long. Sporangia large. 
This is an elongated form, the stem often obtaining the length of 
some feet and the leaves are proportionally long. It has been col- 
lected at Apponaug Pond, R. I., Hartford, Conn., and Worcester, 
Mass., by Dr. Robbins. The large size of the sporangia in contrast 
with the slender leaves and stems is quite marked.! 
A list of the leading works consulted in preparing the preceding paper. 
AaGarpa, C. A. “Species Algarum,’’ 1824. 
Bapineton. “Manual of British Botany.” 
Braun, ALEXANDER. Charae, in Flora, 1835, 1. 
“ Uebersicht der Schweizerischen Characeen,’’ 1849. 
“Charae Australes et Antarcticae,’’? Hook. Jour., 1849. 
“« Characeen aus Columbien, Guyana und Mittel America,’’ Berlin, 1858. 
“Die Characeen Afrikas,’”’ 1868. 
“ Characeen’’ in Cohn’s Kryptogamen Flora von Schlesien, 1877, 
Cosson AND GERMAIN. “Flore dés Env. d’Paris.”’ 
Crepin. “ies Characees de Belgique,” Brux,, 1863. 
De Bary, A. ‘Zur Keimungsgeschichte der Charen,” Botanische Zeitung, 
1875, with two colored plates. 
Dutrocuet. “ Observations sur la Circulation des Fluides chez le Chara 
_ fragilis.” Ann. Sc. Nat., 1838, plate 5. 
GorprrertT & Coun. ‘Ueber die Rotation des Zellenhaltes in Nitella flexilis,”’ 
Bot. Zeit., 1849, p. 665. 
Kuerzine. “Species Algarum,’’ 1849, 
“ Phycologia germanica. 
“Phycologia generalis,’’ 1845. 
“Tabulae Phycologice,’’ 1857. 
LronHARpD1. “ Die bohmischen Characeen,”’ 1862, 
“Die Osterreichischen Armlenchtergewachse, 1864. ; 
‘Mertentus. ‘“Beitrage zur Entwickelungsgeschichte der beweglichen Spiral- 
fasern von C. hispida,’”’ Bot. Zeit., 1844. 
Monraene. ‘ Memoire sur la Multiplication des Charagnes par Division,’’ 
Ann. Sc. Nat., 111, 18, with a plate. 
Mueuuer, K, “ Zur Entwickelungeschichte der Charen’”’ Bot. Zeit., 1845. 
PrincsHEIM. “Ueber die Vorkeime und die nacktfiissigen Zweige der Charen,’ 
Prings., Jahrbucher 111, p. 394. 
1 Besides the species above described three others are mentioned in a Class- 
Book of Botany by Alphonso Wood, 1854; C. foliosa Willd., C. humilis Rid- 
dell, and ©. sabulosa Riddell. We have seen no specimens of these species 
and, as the descriptions in the work referred to are inadequate, we have not in- 
cluded them in the present paper. 
