GENUS IBIS. 



705 



Differentiation of the Starches of the Genus Iris. — Continued. 



Histological Charactekistics. — Continued. 

 Hilum — Form, Number, and Posilion. — Continued. 



/. pumila var. cyanea: Form the same as in /. pallida 

 var. spedosa. Position usually eccentric about 

 0.16 to 0.10 of longitudinal axis. 



/. bismarckiana: Form fairly distinct round or lenticu- 

 lar spot, or cavity sometimes. 4 hila may be 

 present. Hilum seldom fissured. Position usually 

 eccentric 0.25 to 0.14, conmionly 0.16, of longitud- 

 inal axis. 



/. iberica: Form distinct round spot or cavity; some- 

 times 2 hila; usually not cleft. Position eccentric 

 usually from 0.20 to 0.14, commonly 0.20, of 

 longitudinal axis. 



/. xiphium var. Grand Tresorier: Form distinct round 

 spot or cavity, often deeply and irregularly cleft; 

 clefts in form of double-branched roots, irregular 

 cross, flying-bird or dragon-fly type. Position 

 usually eccentric, 0.40 to 0.33, commonly 0.40, of 

 longitudinal axis. 



/. xiphium var. Wilhelmine: Form distinct round spot 

 or deep cavity, often cleft; clefts deep, ragged, 

 irregular, forming a diagonal cross, flying-bird, or 

 dragon-fly type, or a branched, root-like figure. 

 Position usuaUy eccentric 0.40 to 0.33, commonly 

 0.40, of longitudinal axis. 



I. xiphium var. lusifunica: Form distinct round spot or 

 cavity, often cleft either by a straight transverse 

 or diagonal or 2 or more forming a cross or flying- 

 bird tjfpe. Position usually eccentric 0.40 to 0.33, 

 commonly 0.40, of longitudinal axis. 



/. lingilana: Form distinct round spot or cavity, often 

 fissured; clefts often ragged and form a branched 

 root-Uke figure, or a diagonal or transverse cross, 

 or fljring-bird type. Position usually eccentric 

 0.40 to 0.25, commonly 0.33, of longitudinal axis. 



/. relieidata: Form distinct round spot or cavity, often 

 fissured; clefts irregular and ragged, but sometimes 

 form a cross. Position usually eccentric slightly 

 or 0.40 to 0.33, commonly 0.40, of longitudinal 

 axis. 



/. histrio: Form distinct, romid spot or cavity; some- 

 times 2 hila. Often fissured, clefts usually ragged 

 and in form of a cross, flying-bird, or dragon-fly 

 type, or a branching root-like form. Position 

 usually eccentric 0.40 to 0.33, commonly 0.40, of 

 longitudinal axis. 



7. alala: Form distinct round spot or cavity; sometimes 

 3 hila; may be fissured; clefts usually arranged in 

 twos or threes, or in irregular stellate fashion. 

 Position usually eccentric 0.40 to 0.25, commonly 

 0.33, of longitudinal axis. 



/. caucasica: Form distinct round or oval spot or cavity. 

 Sometimes 4 or more hila. Often fissured; clefts 

 commonly diagonal; sometimes a cross or root- 

 like arrangement. Position usually eccentric 

 slightly to 0.33, commonly 0.40, of longitudinal axis. 



Lamelloe — General Characteristics and Number. 



I. florentina: Rather coarse, generally not very distinct, 

 complete and incomplete, 2 sets sometimes, rings 

 around hilum, outer lamellse follow outlines of 

 grains. 13 to 21 on larger grains. 



/. pallida var. spedosa: Indistinct, rather coarse com- 

 plete rings near hilum; distally irregular and 

 probably incomplete. Rarely 20 on larger grains. 



/. pumila var. cyanea: Indistinct, usually fine complete 

 rings near hilum; distally irregular and probably 

 incomplete. 28 to 32 on larger grains. 



/. bismarckiana: Fairly distinct, rings around hilum or 

 otherwise the same as in /. florentina. 10 to 16 on 

 larger grains. 



/. iberica: Not distinct, impossible to determine charac- 

 ter. Number not determined. 



IIiSTOLOQiCAL CHARACTERISTICS. — Continued. 



Lamelloe — General Characteristics and Number. — Cont'd. 



/. xiphium var. Grand Tresorier: Not distinct, a few very 

 coarse lamella; visible. Number not determined. 



/. xiphium var. Wilhelmine: Usually visible, some coarse 

 lamolliE occasionally seen which have the shape of 

 the outline of the grain. Number not determined. 



/ xiphium var. lusitanica: Not dLstinct, some coarse 

 lamelloe visible. Number not determined. 



/. iingitana: Often invisible, when seen rather coarse, and 

 have the form of the grain. When can be counted, 

 14 to 19 on medium-sized grains; 38 on larger. 



I. reticulata: Rather line, distinct, complete regular rings 

 at hilum, probably incomplete, and follow margin of 

 grain when distal to hilum. 22 on fair-sized grains. 



/. histrio: Indistinct, one-third distance from hilum; 

 coarse and follow shape of grain when distal to 

 hilum. Number not satisfactorily determined. 



7. alata: Fairly distinct, rather coarse complete regular 

 rings around hilum; often indistinct for one-third 

 of the distance from hilum, but distinct beyond. 

 25 on larger grains. 



I. caucasica: Often not distinct throughout, sometimes 

 coarse complete regular rings or ellipses near the 

 hilum, probably have the shape of the grains 

 when located at and beyond the hilum. 20 on 

 larger grains. 



Size. 



I. florentina: From 6 to SOjti, commonly 18^. 



I. pallida var. spedosa: From 4 to 32/i, commonly 16^. 



7. pumila var. cyanea: From 3 to 40^, commonly 30m. 



I. bismarckiana: From 4 to 26^, commonly 18jti. 



7. iberica: From 4 to 28m, commonly 18m. 



7. xiphium var. Grand Tresorier: From 4 to 36m, com- 

 monly 24m. 



I. xiphium var. Wilhelmine: From 4 to 34m, commonly 

 26m. 



I. xiphium var. lusitanica: From 3 to 38m, commonly 

 24m. 



7. Iingitana: From 4 to 50m, commonly 30m. 



7. reticulata: From 4 to 46m, commonly 30m. 



7. histrio: From 3 to 36m, commonly 36m. 



I. alala: From 4 to 50m, commonly 33m. 



7. caucasica: From 9 to 49m, commonly 26m. 



PoLARiscopic Properties. 



Figure. 



I . florentina: Eccentric, distinct, usually irregular; lines 



fine, often bent, sometimes bisected. 

 7. pallida var. spedosa: Same as in 7. florentina, but 



centric figure more frequent and lines more often 



straight. 

 7. pumila var. cyanea: Same as in 7. florentina, but the 



lines more often bent. 

 I. bismarckiana: Same as in I. florentina, but figure more 



irregular. 

 7. iberica: Same as in 7. florentina, but figure less irregular. 

 7. xiphium var. Grand Tresorier: The same as in 7. 



florentina, but less irregular and more clean-cut. 

 I. xiphium var. Wilhelmine: Same as in 7. xiphium var. 



Grand Tresorier. 

 I. xiphium var. lusitanica: Same as in /. xiphium var. 



Grand Tresorier, 

 I. Iingitana: Same as in 7. florentina, but more distinct 



and regular. 

 7. reticulata: Same as in I. florentina, but more distinct 



and regular. 

 7. histrio: Same as in 7. florentina, but more distinct. 

 7. alata: Same as in 7. florentina, but more distinct and 



less irregular. 

 7. caucasica: Same as in 7. florentina, but more distinct 



and less irregular. 



