205 



Fig. 124. 



Ilildciihraiidia protolypus. Vertical section of 

 conct'plac lo willi iiiidivided and empty sporansia. 

 Al)Ove a ripe sporangium. ."iUO : 1. 



described development of Ihe coiiceplacles has evidently been l<no\vn to Sciimitz, 

 as can be seen from the diagnosis of tlie genus Hildenbrandia in Schmitz and Hauit- 

 FLEiscn CoralHnacese in Engler u. Prantl, Nat. 

 Pflanzenfam. 1,3, p. 544. It is here said that 

 the conceptacles are "anfangs sehr klein, unter 

 allmahlicli fortschreitendem Verbrauch des 

 naclist angrenzenden Gewebes alhnahlich an 

 Grosse zunehmen", and tliat they frequently 

 fuse laterally together. The development is de- 

 signed as "lysigen" though it is not lysigenous 

 in the usual significance of the word. 



The sporangia are somevs'hat variable in 

 shape and dimensions; they are now ovoid or 

 obovate, e. gr. 21 /i long, 14// broad, now long, 

 nearly cylindric, e. gr. 30 n long, 9,5 ij. broad. 

 The length varies between (16 — )21 and 30 fi, 

 the breadth between 9 and 12(14)/^. No rela- 

 tion between the dimensions of the sporangia 

 and the locality has been found. The dividing 

 walls are always oblique. The first wall is much inclined to one side, the two 

 following to the opposite side and often parallel to each other. But the first wall 

 is often broken where it meets the following walls, in such a manner that the suc- 

 cession of the walls is not always easily discernible. The upper part of the first 

 wall is often bent downwards so that it goes in continuation of the upper secondary 

 wall, and the sporangium thus presents the appearance of having been divided first 



into three by two parallel walls 

 and afterwards by a wall dividing 

 the middlemost cell into two (fig. 

 125 ,/, B, E, F). The secondary walls 

 nearly always intersect the primary 

 one, but usually near its border; 

 this is true particularly of the 

 undermost wall, which may also 

 meet it at the very border or 

 even intersect the outer wall under 

 the border (fig. 125 C). An ex- 

 treme case is shown in lig. 125 K 

 where the sporangium has the 

 appearance of having been divided 

 Fig. 125. by nearly parallel walls; but on 



Hildenbrandia prntoli/pus. A, left side of conceptacle in vertical regardilicf Only the insertions and 

 section. B-K, ripe sporangia. A— F from Karrebreksfjord, G—K. 



from Guidborg. 560:1. not the cuivatures of the walls, it 



