KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55. N:Q 5. 



63 



In several 



sinuated by which an influence from P. crispus can be perceived. The ligules, how- 

 ever, are more persistant and longer than in P. Cooperi and the leaf-apex of another 

 shape. To this come the above mentioned characters of stem-anatomy and conse- 

 quently there are no greater difficulties to discern the tvvo hybrids from each other. 



Finally it should be observed that the unequal size of the pollen-grains does 

 not prevent the crossing betvveen the two species (fig. 21, G). 



Although found in very many places the hybrid appears rather uniform in 

 characters. The variations mostly refer to the leaf width. Usually the stem-leaves 

 are 15 — 20 mm broad. This form I have called: 



f. typicus n. f. — Folia ad 15 — 20 mm lata. 



Another form with broader leaves is found in the »See von Kutzborn», East 

 Prussia, and could be named 



f. latus n. f. — Folia ad 40 mm lata. 



Other individuals again have narrow and more elongated leaves 

 herbaria I have ] abelled such ones 



f. concinnus n. f. — Folia sat elongata, ca. 12—14 mm lata. — 



A rather peculiar plant collected by Dr. Magnin in 1895 at 

 »Leyre, La Mothe» in France, evidently belongs to the hybrid P. 

 undulatus. It resembles very much f. concinnus but with a little 

 more tapered leaf-base and much more numerous nerves anasto- 

 mosing in the apex as in P. prcelongus. The stem-anatomy cannot 

 be derived from any other combination than P. crispus X prcelongus. 

 It may be named: 



f. nervosior n. f. — Folia multinervia ut in P. prcelongo. — 

 Fig. 23. 



This find is most interesting, since P. prceloyigus is not hitherto recorded from 

 south-western France. Perhaps the plant is mislabelled originating in fact from East 

 France. 



Distribution. Denmark, Varming Sö, 00, Baagöe (hb. Stockholm.), Nibså, 

 97, Baagöe (hb. Stockholm.), Gudenå, 95, 99, Baagöe (hb. Stockholm., Uppsal, et 

 Lund.), Kongeå, 96, Baagöe (hb. Lund.). — Liihuania, Vilna, Wolfgang (hb. Stock- 

 holm.), Vilna, Horaninow (hb. Uppsal.). — Besides those from West- and East- 

 Prussia the writer has seen specimens of this hybrid from Gerdau unweit Ulzen», 

 Hanover; and Ar. Bennett records it from Stirlingshire in Scotland near the locali- 

 ties for x P. Cooperi and x P. Bennettii, thus three crispus-hybiiås growing on a 

 limited area. 



Fig. 23. P. undula- 

 tus Wolfg. f. nervosior 

 Hagstr. Top of a stem 

 leaf, -J, showing the form 

 and nervature. 



P. crispus L. x pnsillus L. 



P. Bennettii Fryer Notes etc. in The Journ. of Bot. 1895, 1 ; t. 348. — 

 Fig. 24. 



A. Fryer considers this plant to be P. crispus X obtusijolius. Three facts, 



however, decidedly stånd in opposition to this hypothesis and support the above 



