99 



St 



\ 



f. Ujpica. Fig. 81. 



A. & E. S. Gepp, 1. c. 



f. explanata n. f. Fig. 82. 



Stipe often rather long, 6 cm. or even more. Capitulum of 

 different form, often nearly plateformed expanded with a dia- 

 meter of 10 cm. and more. Filaments in capitulum flabby much 

 more loosely connected than in f. ttjpica ; 

 they are also less incrusted. 



The specimens referred to f. typica 

 (Fig. 81) agree very well with the de- 

 scription and figures of Mr. and Mrs. 

 Gepp. The stipe is short, somewhat 

 thickened above, growing evenly over 

 into the pyriform capitulum. This often 

 has a deepening in the middle and 

 herewith assumes an infundibuliform 

 appearance. 



While this form occurs in more 

 shallow water and often in somewhat 

 exposed places, the f. explanata has its 

 home in deep water and can be con- 

 sidered as a form adapted to live in 

 the altered conditions of life prevailing 

 here. Thus the flat plateformed capi- 

 tulum is assuredly an adaptation to 

 the moderate light, the surface of as- 

 similation being larger, and also the 

 flabby and loosely connected fdaments 

 may be ascribed to the more quiet 

 surroundings. But even if these speci- 

 mens in this way often differ consider- 

 ably in appearance from the f. typica, 

 they are nevertheless easily recognised 

 by means of the densely papillose sur- 

 face of the stalk, a character which, I 

 quite agree with Mr. & Mrs. Gepp, is an 

 infallible character of this species. 



The f. typica occurs at the Danish Islands commonly in a 

 moderate depth (3 — 6 fathoms), only once have I found it in 

 quite shallow water, namely in Krause's Lagoon; in other parts 

 of the West Indies it seems to be common in quite shallow water; 

 f. expansa is found in deep water down to a depth of about 40 meters. 



7* 



Fig. 81. Penicillus pyriformis 



A. & E. S. Gepp. 



Habit of the typical form. 



(About 1:1). 



