116 SIPHOPHYCEJS. 



Consult Thuret in "Anaalesdes Sciences Naturelles, Botanique," 1843. 

 Walz in Pringsheim's " Jahrbucher " for 1866. Braun "Rejuvenescence," 

 pp. 128, 140, and following. 



GENUS 53. VAUCHERIA. D. C. (1805.) 



Characters the same as given above for the Family. 



Two or three arrangements of the European species of Vauclieria have 

 been proposed, differing slightly in detail. The following is that of Pro- 

 fessor Norclstedt : 



VAUCHERIA. 



A. Antheridia not separated from the thallus by a short empty 

 boundary cell. 



a TuBULiGERyE. Antheridia little or scarcely bent, oblong 

 cylindrical, or lanceolate, with an opening at the top. Red 

 pigment bodies not collected in the middle of the mature 

 oospore. Oogonia and antheridia almost stemless. 



* Oogonia nearly round. 



1 V. dichotoma (L) Disecious. 



2 V. ThuretiiWor. Moncecious. 



** Oogonia not round, more or less oval, 

 frequently rather oblique. 



3. V. aversa, Hass. 



4. V. sericea, Lyngb. 



6 COHNICULAT^. Antheridia bent in the form of a horn, or a 

 hook, placed on the short and bent side branches of the 

 thallus. Brown pigment in the middle of the mature 

 oospores. 



aa Sessiles. Oogonia sessile (or with exceeding short 

 stems) beside the antheridia on the thallus. 



5. V. Dillwynni, Ag. 



6. r. sessilis (Vauch). 



1)1) HacemoSfs. Antheridia at the end of a fruit branch, 

 which, somewhat lower down, carries the 

 oogonium. 



* Oogonia turned upwards. 



f Antheridia and oogonia bending in op- 

 posed planes, forming an angle with 

 one another. When the oospores 

 fall they are surrounded by the 

 oogonium membrane, which is not 

 changed to slime. 



7. V. geminata, Walz. 



8. V. hamata, Walz. 



ff Antheridia and oogonia (mostly) 

 bending in parallel planes, the 

 oogonium membrane turns to slime 

 and dissolves. 



9. V. terrestrisy Lyngb. 



** Oogonia turned-downwards. 



10. V. uncinata, Kutz. 



c Antheridia straight, with the top covered, and a pair of fruiting 

 tubes standing out at the side. 



11. V. De Bar y ana, Woron. 



