152 Harper: Exploratioxs in Georgia 1903 



found by C. L. Boynton in July, 1901.* My itinerary did not 

 bring me within sight of either of these rare plants, however. 



. The new species resulting from this trip which have been recog- 

 nized up to the present writing all happen to belong to groups with 

 which other persons are more familiar than myself, so none are 

 described in this paper. Among the lower cryptogams one moss 

 has already been described by Cardot,t another by Warnstorf,| and 

 a fungus by Dr. Murrill. § The first is based on two collections 

 from the lime-sink region, one made in 1902 and one in 1903 ; 

 and the other two new species are each based on a single collection 

 from the Altamaha Grit region. 



Among the pteridophytes and spermatophytes collected in 1903 



the following seem worthy of notice : 



Selaginella arenicola Underw. Bull. Torrey Club 25 : 



541. 1898 

 Previously known only from Columbia sand in Florida, and 



Decatur County, Georgia. I have seen it only on Altamaha Grit 



outcrops in Tattnall County (jios, 18 j^, i860), where it is quite 



scarce. 



Selaginella acanthonota Underw. Torreya 2 : 172. 1902 



On driest sand hills in Tattnall {no, 18^2), Montgomery {no, 

 ig8f) and Liberty counties. A form not quite typical, approach- 

 ing ^. rtipestris, w^as collected on an Altamaha Grit outcrop in 

 Dooly County {no, igsf)^ This species was previously known 

 only from North Carolina, unless some Florida specimens are to 

 be referred to it. 



Sagittaria natans Michx. 



In shallow grassy pools just west of Savannah, all submersed 

 but the flow^ers, June 17 {no. 18 ji). This species has an inter- 

 esting contrivance for protecting its reproductive organs from 

 water. Whenever by any cause the inflorescence is drawn be- 

 neath the surface, the pressure of the water causes each flower to 



*See Blltmore Bot. Stud, i: 143. 1902. 



f Rev. Bryol. 31 : 8. 1904. 



J Bot. Centrabl. Beihefle 16: 25'>. 1904. 

 § Bull. Torrey Club 31 : 600. 19^4. 



