TARGIONIA 35 
Ф branch arising from apex of thallus or thallus-lobe, the pe- 
duncle with a single root-hair furrow,* stomata not stellate. 
h 
median row just back of the Sasol ostioles incon- 
spicuous ; Ф receptacle finally disciforn 
y Cryptomitrium. 
Thallus somewhat firm and rigid, the primary air-c 
soon filled by опакова walls ; Ф receptacle hem- 
Онна al or subconical. 
Capsule at maturity poy filling the broadly 
campanulate involucre and protruding. 
5. zaldia. 
ipo conchoid-bivalved, its cavity Due тенш 
filled by Ше capsule. 4. Reboulia. 
2. TARGIONIA L 5p, PL. 1530, 1765. Ex Mi: Nov, РІ; 
а ee 
Thallus usually rather thick and coriaceous, simple or once ог 
twice dichotomous, innovating at apex or often latero-ventrally, 
broadly costate, areolae mostly indistinct, stomata simple, the 
white-margined pores more or less conspicuous ; chlorophyll-bear- 
ing layer sharply defined, the chambers filled with branched “ соп- 
ferva-like’’ filaments, epidermal cells thick, their walls with trigones ; 
ventral scales reaching to margin or much reduced. Gemmae 
none. Androecium small, disciform, terminating a short latero- 
ventral shoot. Archegonia in a group of several arising just back 
of the apex of the thallus, becoming apparently ventral by the 
over-arching of the surrounding dorsal tissues, without a special 
receptacle, a single archegonium of the group ordinarily maturing 
a sporogonium, this soon surrounded by a somewhat laterally 
compressed, obovoid, subglobose, or hemispherical 2-valved invo- 
lucre, the anterior margins of the latter uniting to form a median 
vertical keel-like suture, finally gaping widely and exposing the 
capsule, the valves rigid, entire-margined, brown or dark purple, 
at times iridescent. Pseudoperianth none.  Sporogonium con- 
sisting of a subglobose capsule, a very short pedicel, and a bulbous 
foot; capsule dehiscing irregularly, its wall of a single layer of 
cells with annular or spiral thickenings. Spores opaque, nearly 
spherical, the outer membrane thrown into ridges and wart-like 
folds, loosely investing the firmer inner coat and occasionally cadu- 
cous, the entire surface minutely and За жеры reticulate ог granu- 
late. Elaters 2—4-spiral, often branche 
* See footnotes on following pages under generic diagnoses of Redoudia and Gri- 
maldia and also remarks upon Cryptomitrium іп Erythea, 5: 87. 1 
