MONOBLEPHA RID ALES 735 



and in having flatter broader bullations, which may, in some specimens, 

 be only slight undulations. Such differences are readily apparent when 

 one has only a limited amount of material, in early stages of develop- 

 ment. If large amounts of the fungus are available, however, and if the 

 plants are observed over a long period of time, these differences become 

 less distinct. One finds that whereas in the sex organs first formed the 

 antheridia and oogonia are often disposed in a definite manner and 

 possess definite, uniform shapes, in subsequent "generations" of such 

 organs on the same hypha these characters vary considerably. Indeed, 

 one may find combinations of polymorpha and brachyandra characters 

 on a single plant. Such combinations are evident in Lagerheim's figures 

 of his species. These remarks apply also to the variety longicollis, which 

 is based chiefly on slight differences in size, shape, and position of the 

 sex organs and stronger bullations on the somewhat smaller oospore. 

 Variations are so prevalent in plants with a profuse development of sex 

 organs that nearly every group might be considered a variety if based 

 on such slight differences. Gemmae have been described by Lagerheim 

 as occurring in M. polymorpha. 



As originally described by Cornu Monoblepharis polymorpha was suf- 

 ficiently inclusive to embrace M. macrandra. 



Monoblepharis fasciculata var. fasciculata Thaxter 



Bot. Gaz., 20: 439, pi. 29, figs. 8-12. 1895 

 (Fig. 54 E, p. 738) 

 Diblepharis fasciculata (Thaxter) Lagerheim, Bih. Kgl. Svensk. Vetensk.- 

 Ak. Handl., 25, Afd. 3, No. 8: 40. 1900. 



Hyphae straight, rigid, cylindrical, simple or (rarely) simple or sym- 

 podially branched at the tips, 1-2 mm. long by 5-12.5 \x in diameter; 

 zoosporangia narrowly cylindrical, zoospores posteriorly uniflagellate, 

 7-9 \i in diameter; antheridia narrow, cylindrical, tapering slightly, 

 straight, not divergent, 10.5-27 [x long by 5-12.5 u. in diameter; anther- 

 ozoids five to sixteen (usually five to eight) in an antheridium, 3 u. in 

 diameter; oogonia oval-oblong, elliptical or cylindrical, with a straight 

 or slightly curved neck or beak which is shorter than the antheridium, 

 23-46 [j. long by 15-27 \x in diameter, arranged singly or in fascicles of 

 two to eight at the tips of the hyphae; oospores subspherical, broadly 



