192 KANf^AS ACADEMY OP SCIENCE. 



PLATE XXI. 



(a) Mnium cuspidatum Hedw., x 8. (b) Comal leaf, (c) Basal cells and 

 border, (d) Part of border cells near apex, showing chlorophyl grains, (e) 

 Base of seta showing vaginule, antheridia, paraphyses and unfertilized arche- 

 gonia. (f) Calyptra. (g) Spores, diameter 30-35 mmm., x 500. (h) Two outer 

 teeth and part of upper edge of capsule, (i) Part of inner peristome, (j) 

 View of peristome from above, (k) Operculum. 



PLATE XXII. 



(a) Atrichum undulatum Beauv., x 3. (b) Dry plant, natural size, (c) 

 Male plant, x 3. (d) Male flower greatly magnified, showing antheridia in 

 the perigonium. (e) Calyptra and capsule, (f) Operculum, (g) Upper leaf, 

 x 60. (h) Basal cells, x 500. (i) Apical cells and border, x 500. (j) Basilar 

 leaf, (k) Cross section of upper leaf, showing the laminae. (1) Perigonial 

 leaf, (m) Part of peristome and upper part of capsule, (n) Spores, diameter 

 18 to 22 mmm., x 500. (o) Antheridia. 



PLATE XXIII. 



(a) Pylaisia Selwynii?, x 5. (b) Dry capsule, (c) Operculum, (d) Tip of 

 male branch, (e) Part of the peristome, showing the inner adherent segments, 

 and divisural line down the center of teeth; also part of the inner membrane, 

 and upper edge of capsule, (f) Verruculose spores, diameter 17 to 22 mmm. 

 (g) Branch leaf, (h) Cells of leaf, (i) Stem leaf, (j) Cells of leaf, (k) Peri- 

 chaetial leaf. (1) Basal cells, (m) Upper cells, (n) Pylaisia velutina B.&S., 

 X 2. (o) Stem leaf, (p) Perichaetial leaf, (q) Capsule, (r) Operculum, (s) 

 Calyptra. 



PLATE XXIV. 



(a) Thelia asprella Sulliv., x 5, from a Wisconsin specimen, (b) Opercu- 

 lum, (c) Spores, showing oil drops, x 500. (d) Part of inner and outer peri- 

 stome and edge of capsule, x 100. (e) Tip of papillose tooth, x 500. (f) Stem 

 leaf, X 100. (g) Leaf cells and ciliate border of same, x 500. (h) Border and 

 cells at base, x 500. (i) Upper rim of the capsule, much magnified, (j) Peri- 

 chaetial leaf, x 100. (k) Tip of cilia on apex, x 500. (1) Basal cells, x 500. 

 (m) Base of cilia from upper edge, x 500. 



