59 



IV. LEPTOGIUM, Fr. Apoth. discoideo-aperta, excipulo proprio ; 

 thallus membranaceus, contextu celluloso. 



1. Tremelloides, (L.) Fr. 



2. lacerum, (Sw.) Fr. 



Trib. II. BYSSE^E, Fr. Thallus filamentosus aut floccosus, baud 

 gelatinosus. Apoth. subexogenea. 



V. THERMUTIS, Fr. Asci thalamio immersi, excipulo proprio e plu- 



ribus fibris hypothalli copulatis enato. 



VI. EPHEBE, Fr. Asci thalamio immersi, excipulo thallode e singula 

 fibra enato. 



1. pubescens, (L.) Fr. (Cornicularia, Ach.) 



VII. RACODIUM, Pers. Asci e fibris ipsis mutatis, contiguis, medio 

 fertilibus. (Sola autonoma generis stirps. Fr.) 



1. rupestre, Pers. 



VIII. BYSSUS, L., Fries. Asci e fibris ipsis mutatis, apice subin- 

 crassatis, articulatis. 



1. aurea, L. (Dematium petraeum, Pers.) 



2. abieiina, (Pers.) Fr. (Dematium, Pers.) 



Byssacece Spurice. 



We bring these in only as an appendix to the System, which ex- 

 cludes them as spurious. They arise either, L in the dissolution 

 of the bodies of other plants, as LepraritB among the Lichenes, 

 Mycinemata among the Fungi, and other like forms among the 

 aquatic Algse ; or, II. from degenerated organs of the vegetative 

 system, as Phylleriaceaz in Fungi, &c. ; or, III. they are the priraor- 

 dia, the first beginnings of other plants, the further evolution of 

 which has been concluded. Such is Pro/enema, green, rooting, 

 persistent threads, which occur in the Filices, the Musci, &c. : 

 Byssodadium, similar threads without color, belonging to the Fungi : 

 Protococcus, the primordial subgelatinous globular gonidia of Al- 

 gffi, which passes into Ulvaceffi, Palmella botryoides, and even 

 Lichenes: and Phycomater, in Fungi, an almost inorganic mucilage 

 without gonidia. 



FINIS . 



