24 Director's Annual Report 
PILICALES: 
Ceropteris calomelanos (LL. ) Und. 
Acrostichum calomelanos l,., Sp. Pl., ii, 1753, 1072. 
Gymnogramma calomelanos Kaulf., Enum., 1824, 76. 
Ceropteris calomelanos (1,.) Und., Torr. Cl., 1902, 29, 632. 
The silver fern is well established on all the islands, gener- 
ally occuring along roadsides and irrigating ditches. 
Ceropteris calomelanos var chrysophylla Link. 
Gymnogramme chrysophyllum Wif., Enum., 1824, 74. 
Ceropteris chrysophylla Wink, Sp., 1841, 143. 
The gold fern has the same distribution as the former but is 
less common. On Hawaii it was observed growing in the steam 
cracks at Kilauea. 
HY DROCHARTEACE Ak: 
Halophila ovata Gaud. 
Halophila ovata Gaud., Freyc. Voy. Bot., 1826, 430, t. 4o. f. 
Flalophila ovalis Hook., Fl. Tas., 1860, ii, 45. 
Miss M. Reed showed me a specimen of this plant which she 
said was identified by Dr. W. A. Setchell. It occurs in brackish 
ponds in the vicinity of Honolulu. 
LEMNACEAE. 
Lemna minor L. 
Lemna minor W,., Sp. Pl., 1753, 970: 
The duck weed is common in ponds and taro patches on all 
the islands. 
CHENOPODIACHAE. 
Amaranthus spinosus L. 
Amaranthus spinosus Yj., Sp. Pl., 1753, 991. 
A rather common weed on Oahu, probably occurring on other 
islands as well. 
CoN. Eno, 1060. ©. “Nuuanu Valley. 
POLYGONACEAE, 
Rumex acetocella L. 
Rumex acetocella \., Sp. P1., 1753, 338. 
The sorrel occurs on all the islands and at all elevations. 
First reported from Kauai by Heller. 
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