46 CYCLOCARPINEX [PTERYGIUM 
appearance, brownish-black. Apothecia and spores not properly 
developed.—Lichiniza kenmorensis Nyl. in Flora Ixiv. p. 6 (1881) ; 
Cromb. in Grevillea x. p. 22(1881). Synalissa kenmorensis Holl - 
ex Nyl. I. c. 
The structure of the thalline squamules agrees exactly with that 
of Pterygiwm. Crombie states that he detected a young apothecium 
terminal on one of the globular squamules. The species requires 
further investigation. 
Hab. On mica-schist rocks in upland regions.—B. M. Shores of 
Loch Tay, Kenmore, Perthshire (the only locality). 
Orpver VI. COLLEMACEA. 
Thallus gelatinous when moist, crustaceous, fruticose or 
foliaceous, mostly homoiomerous, corticated or not corticated, 
sometimes with rhizine. Algal cells Nostoc. Apothecia partly 
closed or open, immersed or sessile, a thalline margin present 
or wanting ; spores usually 8 in the ascus, varying in form, 
simple, septate or muriform. Spermogones with pleurogenous or 
acrogenous spermatia. 
In this family are found the most highly developed of the gelatinous 
lichens. The Nostoc chains retain as a rule their original form, and 
are scattered fairly equally through the thallus, except in some species 
of Leptogiwm which have more of a heteromerous character. 
The following genera are British :— 
Thallus non-corticated. 
Spores simples... deans anupeneeeote erate 23. Physma. 
Spores septate-muriform.....................++ 24. Collema. 
Spores elongate, pluriseptate .................. 25. Synechoblastus. 
Thallus more or less corticated. 
Spores simple .i..i0.e<s-adngacewereateee ton aaa ‘26. Lemmopsis. 
Spores septate-muriform................essesee 27. Leptogium. 
23. PHYSMA Massal. Neag. Lich. p. 6 (1854); emend. A. 
Zahlbr. in. Engler & Prantl Pflanzenf. i. 1*, p. 170 (1906). 
Lempholemma Koerb. Syst. Lich. Germ. p. 400 (1855). Collema 
Sect. A. Lempholemma Cromb. Monogr. i. p. 39 (1894). (Pl. 23.) 
Thallus crustaceous, warted, squamulose or variously lobed, 
or minutely fruticose, non-corticated, gelatinous when moist, with 
or without rhizine. Apothecia innate, with a thalline margin 
which is sometimes cellular; paraphyses slender, simple ; asci 
clavate, often bent or twisted, 8-spored ; spores fusiform-ellipsoid 
or globose, simple, colourless. Spermogones with slender sterig- 
mata and short cylindrical acrogenous spermatia. 
The genus is characterized by the less highly developed thallus 
and by the simple spores. The British species belong to Sect. 
Lempholemma, in which the thallus lies close on the substratum. 
