108 



Arcyria umbrina Schum. Tab. 3, Fig. 8. Schu- 

 macher: Fl. Sæll, No 1479. Fl. Dan.: Tab. 1975, Fig. 1. 



Sporangia single or gregarious, on a thin, shining hypo- 

 thallus, ovate, stipitate. Receptacle on the inner side provided 

 with a network of delicate thickenings. Stem brownish-black, 

 longer than the sporangium. After dehiscing of the sporangium 

 the capillitium enlarges itself but sHghtly. Gapillitium and the 

 mass of spores ochre-brown. Tubes of net of the capillitium 

 with thickenings in the form of half-rings encircling the thread 

 in a spiral, without regard to the thickenings 2.5 — 3 broad. 

 Spores smooth, 5 — 7 jm diam. 



On rotten stumps. — Summer — autumn. Near Copenhagen. 



When comparing the two ^rc«/rm-species delineated in Flora 

 Danica 1975, fig. 1 and 2 w^th the decsriptions of them, it 

 will be seen, that the text to fig. 1 in the reality belongs to 

 fig. 2 , which no doubt is Arcyria cinerea , what also may be 

 seen by comparison of this figure with the authentic figure in 

 Bulhard's Hist, des champ, etc. Tab. 477, fig. 3. 



This error is to be found by all the authors, who have 

 cited tabula 1975 of Fl. Dan. . I beg to observe, that I follow 

 the figure-no. of the tabula and correct the text according to 

 this, consequently for A. cinerea I have cited Fl. Dan. . tab. 1975 

 fig. 2. 



Fig, 1 on the tabula — fig. 2 in the text — Arcyria 

 umbrina Schum. is hitherto quoted as synonymous with A. 

 pomiformis Roth ; but I think, they are rather different both in 

 their shape and in their colour. 



On a rotten stump near Copenhagen I have found the here 

 described Arcyria, which throughout harmonizes with the figure 

 named and with Schumachers description of his A. umbrina, 

 this species I therefore believe to have again found. As may 

 be seen from the description, A. umbrina is in the thickenings 

 on the tubes of the capillitium very different from A. pomiformis 

 and more connected with A. punicea. 



A. punicea Pers. var. cribroides. Tab. 3, fig. 12. 



The inner meshes equal and of ordinary width; on the sur- 

 face of the capillitium on the contrary groups of very small 

 meshes and single larger succeed each other alternately. 



Jutland. 



