Table 1.

The occurrence of fluid-filled schizolytic internal intercellular spaces in liverworts and hornworts. Classifications follow Crandall-Stotler et al. [38] and Villarreal et al. [39] for liverworts and Stotler & Crandall-Stotler [40] for hornworts. C, present at cell corners only; G, fluid replaced by gas; M, large and surrounded by several cells.

class	order family	taxa examined	air chambers	gametophyte	sporophyte	absent (−) or air pores (AP)
Liverworts
Haplomitriopsida	Treubiales	Treubia lacunosa	−	+M	+C	−
	Calobryales	Haplomitrium gibbsiae	−	−	+C	−
		Haplomitrium hookeri	−	−	+Cc	−
Marchantiopsida	Blasiales	Blasia pusilla	−	+Ma	+C	−
	Neohodgsoniales	Neohodgsonia mirabilis	multilayered	+M	?	AP
	Sphaerocarpales	Sphaerocarpos texanus	−	−	−	−
	Riellales	Riella affinis	−	−	−	−
	Lunulariales	Lunularia cruciata	one-layered	−	?	AP
	Exormothecaceae	Exormotheca pustulosa	one-layered	−	?	AP
	Marchantiales
	Aytoniaceae	Asterella australis	multilayered	+M	?	AP
		Asterella tenera	multilayered	+M	?	AP
		Cryptomitrium oreoides	multilayered	+M	?	AP
		Mannia californica	multilayered	+M	?	AP
		Plagiochasma rupestre	multilayered	+M	?	AP
		Reboulia hemispherica	multilayered	+M	?	AP
	Marchantiaceae	Marchantia foliacea	one-layered	−	+C	AP
		Preissia quadrata	one-layered	−	?	AP
	Cleveaceae	Athalamia hyalina	multilayered	+M	?	AP
		Peltolepis quadrata	multilayered	+M	?	AP
		Sauteria alpina	multilayered	+M	?	AP
	Conocephalaceae	Conocephalum conicum	one-layered	−	?	AP
	Corsiniaceae	Corsinia coriandra	one-layered	−	?	AP
	Cyathodiaceae	Cyathodium foetidissimum	one-layered	−	−	AP
	Dumortieriaceae	Dumortiera hirsuta	rudimentary	+Mb	+C	−
	Monocleaceae	Monoclea forsteri	−	−	+C	−
	Monoseleniaceae	Monoselenium tenerum	−	−	−	−
	Oxymitraceae	Oxymitra cristata	one-layered	−	−	AP
	Ricciaceae	Riccia huebeneriana	multilayered	+M	−	AP
		Riccia crystallina	multilayered	+M	−	AP

^aNostoc colonies only.

^bCarpocephala stalks only.

^cIllustrated in Schuster [41].