SAPROLKGXIA 6l 



eauus, but cliflfcr sharply in the presence of an abstricted hypogynal cell. 

 They may be considered as connecting links between .1. Treleaseanus 

 and the typical 5. hypogyna. That 5. hypogyna is very variable is shown, 

 not only in Kauffman's results, but also by the fact that Maurizio has 

 described six forms, or varieties, and one so-called species {S. intermedia), 

 which should be reduced to a form, or variety, and is so reduced by 

 Minden. For other illustrations see Minden ('12), fig. if on p. 520; 

 Tiesenhausen ('12), figs. 2 and 3; and Maurizio as cited below. 



It is certain that in 5. hypogyna and its forms the upgrowths into 

 the oogonia are in most cases at least quite functionless as antheridial 

 tubes, and are of no more significance than in many other species, e. g., 

 in the Fcrax group, where something of the kind is often seen. In such 

 forms, howe\'er, as 5. intermedia and Form V, where the upgrowths 

 have thin walls and dense protoplasmic contents, it is still to be shown that 

 they are without function. For views on this point in practical agree- 

 ment with the above see INIaurizio (Flora 79: 149. 1894) and Kauffman 

 (Ann. Bot. 22: 382. 1908). The species is reported from Lapland by 

 Gaumann (1918) who gives the eggs as I7-20;j. thick. 



For the use of students it is desirable to give a more or less abbrevi- 

 ated description of the seven varieties (exclusive of Kauffman's form) 

 as understood by Maurizio. Five of these (I-V below) were first de- 

 scribed as varieties in Flora (79: 109, pi. 4-5. 1894).* Next was 

 published 5. intermedia (Jahrb. f. wiss. Bot. 29: 97. 1896); and then 

 var. Coregoni (Mitt. d. Deutsch. Fischerei-Vereins 7:55. 1899). We think 

 it best, with our present knowledge (or rather lack of it) to consider 

 all these variants as forms, giving them consecutive numbers up to 

 8, thus: 



Form I — Var. I of Maurizio (pi. 4-5, figs. 5-12). 

 Form 2— Var. II" " (pi. 4-5, figs. 13-16). 



Form 3— Var. Ill " " (pl. 4-5, figs. 17-203). 

 Form 4— Var. IV " " (pi. 4-5, figs. 21-23). 

 Form 5— Var. V " " (pi. 4-5, figs. 24-27). 

 Form 6 — 5. intermedia Maurizio. 

 Form 7 — \'ar. Coregoni ]\Iaurizio. 

 Form 8 — Kauffman's form from Michigan. 



In Krypt. Fl. Mark B. (5: 528. 1912) Minden gives a key to Mau- 

 rizio's first five ^-aricties (he has overlooked the var. Coregoni) which is 

 copied below. On account of the easily accessible originals by Maurizio 



*The plate is double and cannot be separated into two. It should be referred to as 

 plate 4-5. 



