40* BOTANY OF SOCOTRA. 



Tribe 2. Pseudoraphide^e. 



Family. FRAGILARIE.E. 



1. EPITHEMIA. 



Epithemia, De Brebisson, 1838. 



E. gibberula, Ehr. 



var. producta, Van Heurck Synops. 130, t. 32, fF. 11-13 ; Kitton in 

 Jonrn. Linn. Soc. xx. 515. 



Soeotra. Frequent. 

 Distrib. Common everywhere. 



2. EUNOTIA. 



Eunotia, Ehr. 1837. 



E. pectinalis, Ehr. (Miiller); Van Heurck Synops. 142, t. 33, ff. 15, 10. 



Conferva pectinalis, Dillid. Brit. Conferv. 1809. 



G. bronchialis, Both. Cat. Bot. i. 186. 



Eunotia depressa, Ehr. Verb. 



Fragilaria pectinalis, Belfs. Ann. Mag, Nat. Hist. xii. 107. 



Himantidiiom pectinate, Kiitz. Bacill. 39; Smith Synops. ii. 12, t. 32, f. 284. 



Soeotra. Frequent. 



Distrib. A widely distributed species. 



3. FRAGILARIA. 



Fragilaria, Lyngbye, 1819. 



F. Ungeriana, Grunow 1803 ; Kitton in Journ. Linn. Soc. xx. 514, t. 48, 

 f. 4. 



Frustules narrow, linear, with distinct marginal puncta, coherent forming 

 long filaments, valves linear constricted near the rounded apices, striate, the 

 striae becoming indistinct as they approach the centre. Length -0090" to '01G0", 

 breadth -0003. 



Soeotra. Common. 



Distrib. Cyprus, Belgium. 



This form was found by A. Grunow in a gathering made by Dr linger in 

 the Island of Cyprus, and subsequently described by Herr Grunow in 

 Verhand. der. k. k. Zool. Bot. Gesell. Bd. xiii. 1803. Col. Mason more 

 recently found it growing in abundance in Belgium; in a dry state the filaments 

 have a beautiful silvery green lustre ; single frustules very closely resemble 

 Syuedra ulna. 



