262 PROCEEDINGS OF SECTION D. 



In a number of species it will be found that the goni dial-layer 

 of the thallus consists of blue-green granular gonima, very similar 

 in general outline to the Nostocacece group of Algce. Through the 

 discovery of these distinct organisms, Dr. Nylander was prompted 

 to establish the genus Stictina based solely on these distinctive 

 characters. 



It has been found by Knight (10), who has examined several 

 Lichens determined by Nylander in the Kew collection, that 

 Nylander has not in every case arranged the species in accordance 

 with his own scheme of classification. 



By far the greatest number of Stictacese have the gonidial layer 

 made up with chlorophyll-green coloured gonidia, which resemble 

 the Palmellaceae group of Algae ; but occasionally we find that the 

 thallus of some species is peculiar in including a second algal con- 

 stituent in addition to the species which is its principal and constant 

 constituent. For example, the chief algae in Loharia laciniata 

 resembles those of the Palmellaceae group, but in addition to these 

 we very often find some Nostoc-\ike gonidia in the peculiar shaped out - 

 growths from the thallus, which have received the name of Cepha- 

 lodia. 



Occasionally we also find a combination of two distinct Lichens, 

 as in the case of Dendriscocaulon filicinellum, which is distinctly 

 blended or fused in a graft-like fashion with Sticta stipitata, and 

 which led the late Rev. F. R. M. Wilson to beheve that the former 

 was the juvenile state of the latter species (30). 



Systematic Arrangement of the Species. 

 (A) Genus : Loharia (Scrheb.), Hue. 



Section L— Knightiella (Miill-Arg.), A. Zahlb. 



Gonidial-layer of the thallus consisting of bright-green 

 Cystococcus-gonidia. 



L. leucocarpa, A. Zahlb. (32, p. 188),; Parmelia splachnirima. 

 Hook. f. and Tayl. (25, p. 645) ; Bceomyces sqiiamari- 

 oides, Nyl. (17, p. 184), Wils. (29, p. 146), (28, p. 175) ; 

 B. splachnirmms, Bab. & Mitten (3, p. 351, tab. cxcix) ; 

 Knightiella leucocarpa, Miill-Arg. (13, No. 1009 et 1010) ; 

 K. squamarioides, Miill-Arg. (13, No. 1357). 



Tasmania : Mount Wellington (Archer), Huon Road (Bas- 

 tow, No. 816). 



Victoria : Mount Wilham, alt. 5000ft. (SuUivan, No. 85). 



Section II. — Ricasoha (D. Notes), Hue. 



Gonidial-layer of the thallus, with bright green globular or 

 sphaeroid Protococcoiden-gonidia. 



L. plurimseptata, Kn. M.S., Shirley (21, p. 66), (22, p. 133) ; 

 Cheel (5, p. 689). 



