Tubidina. 35 



Sub-sect. TUBULINAE. 



TUBULINA, Pers. (emended). 



Sporangia scattered and regular, or irregular and forming a 

 plasmodiocarp, or compacted together to form a naked or corti- 

 cated aethalium ; walls very thin, single, often iridescent, not 

 perforated; columella and-capillitium absent. 



Tululina, Persoon, Syn. Fung., p. 197 ; Host., Mon., p. 219 ; 

 Cooke, Myx. Brit., p. 54 ; Sacc., Syll., Vol. vii. p. 406 ; Schroeter, 

 p. 102; Zopf, p. 172 f. Licea, Schrader, Nov. PL gen., p. 17 ; Rost., 

 Mon., p. 218; Schroeter, p. 102 ; Zopf, p. 171 ; Sacc., Syll., Vol. 

 vii. p. 404 ; Cooke, Brit. Myx., p. 54. LindUadia, Fries, Summ. 

 Veg. Scand., p. 449; Rost., Mon., p. 223 ; Cooke, Myx. Brit., p. 

 55 ; Sacc., Syll., Vol. vii. p. 408 ; Zopf, 172. 



A careful examination of ample material has convinced me 

 that the three genera given above constitute but one natural 

 genus, and Tulmlina, having priority, has been adopted. The 

 structure and origin of an aethalium being unknown to the old 

 mycologists, explains the origin of these genera; but it is 

 remarkable that Rostafinski, who so lucidly explains the origin 

 and value of aethalia, did not notice the sequence so clearly 

 stated in his own diagnoses of the three genera, which he 

 retains. In all three the sporangial walls agree in being 

 membranaceous and not. perforated; Licea has the sporangia 

 regular, as in L. minima, Fr., or irregular and forming a 

 plasmodiocarp, as in L. flexuosa, Pers. ; in Tubidina the sporangia 

 are cylindrical or prismatic from mutual pressure, and combined 

 to form a naked aethalium ; while in Lindbladia, the sporangia 

 also form a naked aethalium, but although prismatic, as in 

 T'ubulina, are not quite so much elongated ; finally, the species 

 described as Licea spumarioides, Cke. and Mass., belongs to one 

 of the trio, but differs from all in having the sporangia flexuous, 

 and in the aethalium being covered with a common cortex. If 

 Rostafinski's view as to the autonomy of the three genera in 

 question is correct, it follows that the aethalioid condition of 

 such species as Hemiarcyria ruMformis, Rost., must not only 

 be separated from the form with simple, normal sporangia, 



