150 



The Irish Naturalist. [July, 



**Oogonia at all places of division of the leaves, 

 whorls open, ?'.£., not crowded, end-segments often 

 3-celled. 8. N. gracilis. 



** Oogonia mostly lacking at the first places of divi- 

 sion, whorls "balled," "massed" or crowded; 

 end segments always two-celled. 



9. N. tenuissima. 



2. vSexual organs only at the primary ray. 



[10. N. confenmcca.] 



b. Sexual organs with gelatinous envelope : 



II. N. batrachospcrma 



or N. Nordstedtiana. 



B. Whorls with numerous, mostly 16, accessory leaves called 



stipular leaves : Heterophylte. [12. N. hyalina.] 



[III. Leaves divided several times, end-segments 3 to 5-celled 



Polyarthrodactylce. 13- N- ornithopoda,~] 



REVIEW OF SPECIES OF TOLYFELLA, Leonh. 



I. Moncecious. 



A. End-cells of leaves pointed or acute. 



a. vSterile leaves simple. 14. T. prolifera, Leonh. 



b. Sterile leaves divided. 15. T. intricata, Leonh. 



B. End-cells of leaves blunt or obtuse. 



a. With one to several sterile leaf whorls. 

 aa. Oospore not above 370 ft long ( T \j inch), membrane 



minutely punctate. 16. T. glomerata, Leonh. 



bb. Oospore not less than 380 /i long (^V inch), membrane 



smooth. 17. T. nidifica y Leonh. 1 



\b. Without sterile leaf whorls. [18. T. Normanniana.~\ 



[19. T. hi span it a .] 



1 The following note bearing on the late Dr. D. Moore's Irish specimens, 

 preserved in the Science and Art Museum, should justify the inclusion 

 of the species in the Irish flora: — 



T. nidi/lea, A. Braun : " F'ragmente einer Monographic der Characeen." 

 (Abhandl. der konigl. A /cad. Wissenseh. Berlin, 1882, p. 94.) 



Forma intermedia, Frankreich, Hyeres(Var.) (Antheridien auffallend 

 gross, o, 44 — , 47 mm. dick). Accedens ad glomeratam. — Irland. Dr. 

 Moore in herb. Hooker. (Form, die iichte init T. inlricata und prolifera 

 oder zuniichst N. glomerata zu verbindeu scheint). Habitus N. nidificae 

 balticae, folia verticilloruni fertilium eodem modo incurva et obtusa. 

 Color nigrescerjs. Semi n a minora niagis contorta 10-gyrata, unicif, 

 o, 46 — ,48 mm. lang, ohne Kronchen o, 43— ,44 mm. lang, Kern hell 

 gelbgriin o, 30 — 0.35 mm. lang. 



